When the boar a scant seventy-five feet away, he fired.

We must try hard to improve our basic skills.

我们要努力加强基本功.

We can overtake him asas we try hard again!

只要我们再努一把力,是会赶上他的!

You must try hard to improvement your command of English.

你必须下苦功努力提高对英语的运用能力.

Jennifer: I think I would try hard to adapt myself to them.

珍妮佛: 我想我会努力尝试着使自己去适应他们.

To achieve our goal, we must try hard to solve these questions.

要实现我们的目标我们必须努力解决solve这些问题.

If you try hard enough, your dream will surely come true.

只要你尽力去做, 你的梦想一定会实现.

Try hard to win success.

努力争取胜利.

He said he would try hard to meet your wishes.

他说,他将尽力满足你们的愿望.

So I try hard to find opportunities for people like you.

所以我努力为像你这样的人寻找机会.

If you try hard, you will succeed.

如果你努力, 就会成功.

Life generates methane, ammonia, oxygen, hydrogen, carbon dioxide, and many other gases.

生命生产出甲烷 、 氨气 、 氧气 、 氢气 、 二氧化碳以及其他气体.

He was busy filling out the balloon with hydrogen.

他正忙着给汽球充氢气.

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.