He was busy filling out the balloon with hydrogen.

Hydrogen is an important feedstock used in petrochemical enterprises � � hydrogenation process.

氢气是石化企业加氢工艺的重要原料.

The characteristics of conversion processes and sorts of reactor are discussed.

用甲烷作原料制备氢气有重要意义.

In the cells of living systems there are many elaborate chemical reactions.

在生命系统的细胞里有许多复杂的化学反应.

Compounds can often split up by chemical reactions into their constituent elements.

化合物常能通过化学反应分解为构成该化合物的各个元素.

Processes that consist of molecular changes are called chemical reactions.

包含分子变化的过程称作化学反应.

The invention relates to a acid tromethamine salt , of which the formula is C 18 H 23 NO 5.

一种联苯乙酸氨丁三醇盐, 化学式为C18H23NO5.

The simplest ratio of the ions in the crystal is known as the formula unit.

离子晶体的单位化学式就是其中不同离子间的最简比.

He can never write chemical formulas correctly for chemical reactions.

他总是不能准确地写出化学反应的化学式.

Teacher: Donald, what is the chemical formula for water?

老师: 唐纳, 水的化学公式是什么?

Hull construction's materials & scantling designs are to be complied with the rules of Classification Society.

船体结构的材料 及 构件尺寸设计应满足船级社规范要求.

Scantling of plates and sections will be in accordance with rules requirements and Builder's practice.

一些板和部件的结构尺寸必须根据规范要求和建造者的惯例.

There are many ways to keep the chemical equation of many group Balancing coefficient balance.

多组配平系数方程式的配平,方法较多.

Don't you find it upsetting to reduce an emotion like love to a chemical equation?

你不认为将爱情这种情感降低为一种化学方程式有些扫兴 吗 ?

One should clearly state the visible change and write down the chemical equation involved.

须清楚写出可见变化和有关的方程式.

I little realised at the time what a tremendously false step mine had been!

那时我一点也没意识到我跳的是多么错误的一步 啊 !

He was tempted into making a false step.

他被人引诱去做了一件蠢事.

A false step brought her suddenly to the ground.

一次失足突然让她跌到地上.

He who has learnt to dance correctly never makes a false step.

已学会正确跳舞的他从未犯过错误.

A false step will make a great difference to your future.

错走一步对你的前程来说会产生很大影响.

Onece you take a false step, you will lose his favor.

一旦你行动失误, 他就会对你不再有好感.