1、expert

行家;專家

Our team of experts will be on hand to offer help and advice between 12 noon and 7pm daily.

每天中午12點到下午7點，我們的專家小組將隨時提供幫助和建議。

a yoga expert.

瑜伽大師

技術嫻熟的;熟練的;在行的

The Japanese are expert at lowering manufacturing costs.

日本人在降低制造成本方面很在行。

There is a great deal to learn from Hal's expert approach.

從哈爾熟練的方法中可以學到很多。

行家的;內行的

When the horse suffered a back injury Harvey cured it with his own expert hands.

那匹馬背部受傷后，哈維用他內行的雙手把它治好了。

The symptoms are very mild and it takes an expert eye to see them.

癥狀非常輕，要靠專家的眼睛才能看出來。

2、certain

肯定的;有把握的;毫無疑問的

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

她堅信自己會出人頭地。

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

我們不敢肯定闌尾是否已經破裂。

必然的;必定的;肯定的

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

然而，這項計劃一定會遭到漁民領袖的反對。

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

即便來自陣線的候選人獲勝，他們能否接受他還說不準。

確鑿的；無疑的

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

有一點可以肯定，那就是雙方都非常尊重對方。

It is certain that Rodney arrived the previous day.

羅德尼肯定是頭天到的。