You'd better express the letter; it's urgent.

I'm afraid some pressing business has come up.

也许有些紧急的事要办.

He had one of his most essential letters to write.

他还有一封十分紧急的信要写.

Snaky well is a new type of complex well. The wellbore pressure drop of snaky well can't be neglected for its producing interval has large fluctuation, and the conventional productivity calculation methods for horizontal wells could not be applied directly for snaky wells.

蛇曲井是一种新的复杂结构井，其生产井段起伏较大，不能直接用常规水平井产能公式计算其产能。

A time sequence analysis on the two provinces has been made, and the data present large fluctuation, which represent the great change of the same province during development course. 3.

论文通过对时间序列的数据进行分析，数据呈现较大的波动性，说明同一省份发展历程有较大变化。3.发展模式的形成与演进原因是多方面的。

The results show that there is a certain difference of the contents of elements among the main 7 types of soil and a comparatively large fluctuation of element contents in the same soil sample.

结果表明，七种主要类型土壤相互间元素含量有一定的差异；同一土壤中元素含量波动较大。

Objectives The variation of the size distribution of radioactive aerosols may cause a large fluctuation of lung dose caused by radon and its daughters.

天然放射性气溶胶粒径分布的变化会引起氡及其子体所致肺剂量的较大涨落。

Correlation between sludge yield index ( SYI) and MLVSS/ MLSS ratio has established, and by this correlation the causes of large range fluctuation of SYI are discussed.

通过建立污泥产率系数与MLVSS/MLSS比值的关系，论述了污泥产率系数会在较大范围内变化的原因。

The output power of high-power semiconductor lasers is greatly influenced by the temperature change, small temperature change can cause large fluctuation in output power and wavelength, threshold current and life will be affected.

大功率半导体激光器的输出功率受温度变化的影响很大，微小的温度变化就会导致输出功率很大的波动，而且波长、阈值电流和使用寿命也会受到影响。

High diversity during non-outbreak phase can suppress large fluctuation of defoliators.

非暴发期的多样性高可降低害虫的变动幅度。

Compared with perturbation stochastic component method, results of recursive combining with component method to random eigenvalue problems of large-scale and complicated structural systems involving random variables of large fluctuation levels can better approximate those of Monte-Carlo simulation.

对于在较宽随机涨落范围内大型复杂结构的随机特征值问题，相对于摄动随机子结构方法而言，递推子结构结合法的结果能够更好地逼近蒙特卡罗模拟解。

Many researches found that the complex Dielectric Parameters show a large fluctuation with the change of working wavelength; this will seriously affect the physical quantities such as Surface Plasmon propagation length.

物理实验研究发现，贵金属的复介电参数会随工作波长变化呈现出较大浮动，这对表面等离子体波传播长度等物理量的计算产生重要影响。

Contrary to the above, the brake torque curve of the C/ C composite with smooth laminar ( SL) pyrocarbon structure showed large fluctuation and small dimension loss, on its worn surface was generated rougher debris layer at normal landing condition.

具有光滑层热解炭结构的炭/炭复合材料在正常着陆条件下刹车力矩曲线波动很大，磨损较小，摩损表面形成较为粗糙的磨屑层；

Based on the char-acteristic of large fluctuation in static head of the drainage pumping station of a hydropower station, this paper presents a mathematic model for economic operation of the pumping station with calculating method and example.

本文根据水电站排水泵站静扬程变幅大的特点，建立了泵站经济运行的数学模型，给出了计算方法，并附有算例。

Example calculation shows that the steady state productivity model of snaky well should be used in calculating the productivity of a horizontal well with large fluctuation;

实例计算表明：当井的水平段起伏较大时，不能将其处理为水平井，而应根据蛇曲井产能计算模型计算其产能，否则将导致产能预测出现较大偏差。

Further studies show that, neither in the long run nor short run, the shock from exchange rate is the key factor to the large fluctuation.

进一步研究表明，无论短期还是长期，汇率冲击都不是造成贸易差额大幅变动的关键性因素。

Unlike normal commodities, perishable goods have long production cycle, short sale season and large demand fluctuation, which bring more difficulty to the coordination of such supply chain.

易逝品不同于一般商品，通常生产周期长、销售周期短、需求波动大，使制造商和销售商面临更大的风险，供应链协调的难度也更大。

In summer and autumn, the sediment is of find grain size, bad sorting and high BSi contents; in winter and spring, it is of coarse grain size, worse sorting, large fluctuation and low BSi contents.

研究发现夏秋季沉积物颗粒偏细、分选差，生物硅含量高；而冬春季沉积物颗粒偏粗、分选更差、各参数波动范围大，生物硅含量低。

Some research state clearly: random dynamic respond of large fluctuation levels can be given rise to random variability of structure's parameters and sometimes it becomes leading factor.

众多研究工作表明：结构参数的随机变异性可以引起结构随机动力响应的随机涨落，结构力学参数的随机性还可能成为主导因素。

Along with the liberalization comes large fluctuation of interest rate, quick rising of interests rate risk of commercial banks and thereafter many financial institutions' bankruptcies due to great losses caused by interests rate risk.

伴之而来的是市场利率大幅波动，商业银行的产品定价面临巨大挑战，利率风险急剧上升，大批金融机构由于市场利率波动造成的巨大损失而倒闭破产。

Sewage wastewater of the scenic spot, which consists in a large fluctuation of water character and flow, is required to be treated fully, especially its requirements of color and odor.

风景区生活污水的水质水量变化大，要求深度处理，尤其是色度和臭度。