That boy scraped his knee when he slipped and fell.

The boy fell and scraped the skin off his knee.

这男孩摔了一跤,擦破了膝盖上的皮.

He scraped his boots clean before coming into the house.

进屋前他先把靴子擦干净.

Air dried lumber is often preferred for its natural beauty and strength, as well as its reduced risk of warping or cracking compared to kiln-dried lumber.

与窑炉干燥的木材相比，空气干燥的木材常因其天然美丽和强度，以及相对较小的翘曲或开裂风险而受到青睐。

Air dried lumber is wood that has been allowed to dry naturally over time, without the use of kilns or other artificial drying methods.

空气干燥的木材是指在时间的自然作用下干燥，没有使用窑炉或其他人工干燥方法。

The main points for designing the feeding mechanism were stated.

送料机构是缝纫机四大机构中最复杂、最重要的机构.

The tragedy of the main points of his drama, history and comedy.

他的戏剧主要分悲剧, 历史和喜剧.

Write down the main points so that you won't forget them.

你把要端写下来,这样就不会忘记了.

The main points in these two books are nearly the same.

在这两卷书里的要点几乎是相同的.

The designing parameters and the main points are offered.

提出胶管组合件的设计参数和要点.

She noted down the main points of the speech.

她把演说的要点记了下来.

But CES lumbers on, to the extent that with each passing year, the shows become harder to tell apart.

但CES还是艰难生存，已经到了每年的展览都毫无新意的程度。

The possibility of a non-destructive transverse vibration technique was studied to evaluate static bending elastic properties of full-size lumbers.

该文通过比较大尺寸规格材动态和静态弹性模量之间的相互关系，探讨利用横向振动方法预测大尺寸板材抗弯弹性性质的可行性。

Firstly we study the changes of wood characteristics when larch lumbers were dried to different moisture content level under different temperature, analyses the influence to wood characteristics and drying quality caused by temperature and moisture content.

首先研究了落叶松在不同温度下干燥至不同含水率时的材性变化，分析了温度、含水率对材性及干燥质量的影响；

It is showed that the relative errors were less than 15% between prediction and trial values, when composite lumbers have low peel rate and classical lay theory is tenable.

表明当复合板的剥离率较低，满足经典层合理论假设时，刚度模型预测值D11与实际MOE值之间能较好拟合，预测值和实验值之间的相对误差小于15%。

Study on Types and Distribution of Visual Characteristics about Chinese Fir Dimension Lumbers

杉木目测分等规格材缺陷类型及分布的研究

Temperature gradient promotes transfer of moisture in larch lumbers, but should form and maintain long time temperature gradient to accelerate drying rate through proper schedule;

温度梯度可以促进木材内部水分的传递，但应通过采取适当的工艺形成并维持较长时间的温度梯度来加快干燥速度；

Every morning, he used a lorry to carry the lumbers to the railway station.

每天上午，他用一辆卡车装运木材去火车站。

Factors influencing the drying quality of small-diameter birch lumbers

小径木白桦锯材干燥质量的影响因素分析

Glue immersion is an important process that influences the properties of reconstituted bamboo lumbers.

讨论胶黏剂固体含量、浸胶方式、浸胶时间等因素，对重组竹材物理力学性能的影响。

Several Kind of Lumbers Tree Seed's Recognition

几种木材树种的识别