In the Warring States Period, Pui coins, Bu currency, knife currency, and round currency were in circulation in different countries and regions.

Isolation and preparation of ammonium hexafluorophosphate by precipitation of the hexamine nickel(ⅱ) salt

六氟磷酸铵的分离与制备&六氨合镍盐沉淀法

Study on the solid state reaction of coordination compound ⅰ. synthesis and application of cobalt(ⅱ) hexamine complex

固相配位化学反应研究Ⅰ.钴（Ⅱ）－六次甲基四胺配合物的固相合成与应用

At the same time, the braking material based on benzoxazine from bisphenol and phenolic resin in the presence of hexamine and Lewis acid have been prepared, and the frictional coefficient, tear and wear propert, impact strength and hardness of this material have been determined.

同时制备了以六次、线酚、中间体为主要树脂基体的制动材料，并测定了制动材料的摩擦磨损性能、冲击强度和硬度。

The Microscale Improvement on Hexamine Cobalt Chloride Preparation Experiment

对三氯化六氨合钴（Ⅲ）制备实验的微型化改进

The separation of hexamine wastewater for reverse osmosis

反渗透法浓缩分离乌洛托品废水

These werecharacterized by cyclic voltammetry in the presence of ferrocenemonocarboxylate and hexamine ruthenium as probe molecules.

这些用以单羧酸铁和六甲基四胺合钌作为探针分子的循环伏安法来表示。

The research on the strengthening of starch surface sizing agent modified by hexamine and ammonium persulfate

乌洛托品&过硫酸铵改性的淀粉表面施胶剂增强作用研究

Hexamine in tablets or sticks for use as fuel a candy shaped as a bar.

片状或棒状的六甲烯胺，用作燃料形状像一条棒的糖果。

The mechanism of the adsorptive catalytic wave of Ti(ⅳ)-cupferron ( cup) complex in the presence of ( NH_4)_ 2SO_4 and hexamine ( pH6.0) is studied.

本文研究了在0.05mol/L（NH4）2SO4,0.2mol/L六次甲基四胺（pH6.0）底液中Ti（Ⅳ）-铜铁试剂（cup）体系络合吸附催化波的机理。

A sneeze can travel as fast as 100 miles per hour.

人打出的喷嚏的速度可达每小时100英里.

Jack : Just a second. Use my special bag. Don't waste your sneeze.

等一下. 用我这个特制袋. 不要浪费了你的喷嚏.

A baby's sneeze is not very loud.

婴儿的喷嚏不太响.

Lily: I like the red sofa. Aachoo!

莉莉: 我喜欢红色的沙发. 啊嚏!

Lily: Aachoo! I'm cold. Please close the window.

莉莉: 啊嚏! 我觉得冷. 请关上窗户.

Proper stents and reasonable treatment including use of antitussive, apophlegmatisant and antibiotics could decrease the degrees of cough within postoperative 3 days, and expectoration difficulties, volumes and mucin contents of sputa in postoperative 1 to 2 months.

合理选择支架、镇咳化痰药物及抗生素等措施可以减轻术后3d内患者咳嗽频繁程度及术后1~2个月咯痰困难程度、咯痰量与粘蛋白含量的增加。

The tasks have been ranked in order of difficulty.

按照困难程度对工作进行了分类。

Results: Clinical studies show that amelioration about of frequency of defecation, excrementitious shapes and difficult degree of defecation in the treatment group better than control group, there was significant difference ( p0.05).

结果：临床研究表明，试验组对排便频率、粪便的形状及排便困难程度的改善明显优于对照组，存在显著差异（p0.05）。

3~ 14 d after heart operations, density of phlegm, difficulty in expectoration, pneumonic rales, respiratory complications and side effects of drugs were observed and compared.

观察比较两组患者术后3～14d咳痰困难程度、痰液粘稠度、排痰难度、肺部罗音、呼吸系统并发症及副作用。

But, if you think about it, y tells me how far I am from the x-axis, so how hard it will be to spin around the x-axis.

但仔细想想，y给出的其实是到x轴的距离，这就是绕x轴旋转的困难程度了。

And I think anyone attempting to invest ethically should have respect for the complexity and difficulty of the task

我认为任何打算进行合乎道义的投资的人应该考虑到它的复杂性和困难程度。