The first thing to be sure of is whom science should serve.

Be sure of this and just wait on Him.

确信这一点,只要等候他.

Be sure of it; give me the ocular proof.

相信它; 给我可见的证据.

An amusing bit of copy would circulate until no one could be sure of its origin.

一则有趣的文字往往流传到谁都不知道它的出处.

As amusing bit of copy would circulate until no one could be sure of its origin.

一则有趣的文学往往流传到谁都不知道它的出处.

Can I be sure of a profit if I invest?

我要是投资,肯定能获利 吗 ?

Perhaps we can be sure of the facts before they arrive.

在他们到来以前,也许我们可以把情况弄弄清楚.

A lot of people think that it's better to pay for their education so that they can be sure of getting quality.

许多人认为最好是接受付费教育，这样能确保教学质量。

She looked over her shoulder to be sure of her footing.

她扭头看了看后面以确认自已是否站稳了.

Be sure to make him believe it.

务使他相信此事.

If you ever cometo Dalian, be sure to let us know.

(任何时候)你若到大连来, 务请通知我们一声.

Be sure to make it clear and concise and avoid long-windedness.

注意简明扼要,反对长篇大论.

Be sure to write and give me all the news.

务必写信告诉我所有的消息.

Be sure to do the sowing in good time.

确保适时播种.

Be sure to remind her to come back early.

一定要提醒她早点回来.

Be sure to dig the whole garden over before winter.

在冬季来临前要把园子好好地翻一下.

Get up steam, and you will be sure to succeed.

加把劲, 你一定会成功的.

Be sure to select firm, unblemished fruit.

一定要选坚实、无疤痕的果子。

Be sure to read about how mozzarella is made, on page 65.

务必看看莫泽雷勒干酪是怎么制成的，在第65页。

If she lasts a couple of hours, I shall be surprised.

她要是能拖上两个小时, 我将非常吃惊.

Years hence I shouldn't be surprised if I have trouble with her.

多年以后,如果跟她处得不好,我也不奇怪.