1、open up

（使）（地方、经济、兴趣领域等）开放

As the market opens up, I think people are going to be able to spend more money on consumer goods.

随着市场的放开，我认为人们将能够增加用于消费品的支出。

He said he wanted to see how Albania was opening up to the world.

他说他想看看阿尔巴尼亚是如何对外开放的。

（使）（机会、可能性等）出现；（使）产生

It was also felt that the collapse of the system opened up new possibilities.

人们也认为这一制度的崩溃带来了各种新的可能性。

New opportunities are opening up for investors who want a more direct stake in overseas companies.

希望更加直接地参股海外公司的投资者获得了新的机会。

开…的门

Three armed men were waiting when the postmaster and his wife arrived to open up the shop.

当邮政局长和妻子到邮局开门营业时，3名持械男子正等着他们。

Open up, or I break in!

把门打开，不然我要砸门了！

2、certain

肯定的;有把握的;毫无疑问的

She's absolutely certain she's going to make it in the world.

她坚信自己会出人头地。

We are not certain whether the appendix had already burst or not.

我们不敢肯定阑尾是否已经破裂。

必然的;必定的;肯定的

However, the scheme is certain to meet opposition from fishermen's leaders.

然而，这项计划一定会遭到渔民领袖的反对。

It's not certain they'll accept the Front's candidate if he wins.

即便来自阵线的候选人获胜，他们能否接受他还说不准。

确凿的；无疑的

One thing is certain, both have the utmost respect for each other.

有一点可以肯定，那就是双方都非常尊重对方。

It is certain that Rodney arrived the previous day.

罗德尼肯定是头天到的。