This is it -- I'll have to make up my mind now.

If there is a heaven on earth, this is it!

人间若有天堂, 非此莫属!

If anything definite can be said, this is it.

若能稍有把握地说出来, 其实是这样.

This is it. This is the place. It looks good.

就是这里. 就是这个地方. 看起来不错.

This is it can base forest on the world clothing important attribute.

这是它能立足于世界服装之林的重要因素.

If there is a heaven on earth then this is it!

如果人间有天堂,那么这里就是!

This is it, this is the problem that caused us to fail.

说得对, 这是导致我们失败的问题.

This is it! This is the house I've always dreamed about.

终于到了! 这就是我魂牵梦绕的那所房子啊!

This is it -- we have to act at once.

现在是 关键 时刻了--我们得马上行动.

We've been looking for a house for months and I think this is it.

我们找房子已经找了好几个月了,我看这所就是我们要找的.

There is a large number of boys in this class.

这个班里有很多男孩子.

Many pupils in this class got prizes for good conduct.

这个班的许多学生因为操行好而得了奖.

There are altogether 40 students in this class.

这个班总共有40名学生.

Most of the students in this class are good at mathematics.

这个班的学生多半数学很好.

The work of this class has been falling behind recently.

近来这个班的成绩一直处于较低水平.

I have been given charge of this class.

我被分配负责这个班。

From the time of the birth of this child, her health gradually sank.

生育之后, 她的体质就日渐衰弱.

This child doesn't look right. Perhaps he's ill.

这孩子脸色不对头, 恐怕是病了.

This child is always making trouble for his parents.

这孩子老给父母招灾惹祸.

This case is still unknown.

这个案子还是个问号.

This case is full I can't pack any more clothes in.

这箱子已装满,我塞不进更多的衣服了.