某事

Engage in doing sth.

忙于做某事。

Have fun/enjoy oneself doing sth.

做某事很高兴

For example, what if someone or something traveled back in time and changed the ensuing future?

例如，如果某人或某事来回的时间，改变了随后的未来？

Obviously ... If we want to do something..., it is essential that...

显然，如果我们想做某事，很重要的事情是要。。。。。。

If we want to do something…, it is essential that

显然，如果我们想做某事，很重要的是

Excuse sb. for doing sth.

原谅某人做某事

Excuse sb. for sth.

原谅某人某事。。

A new pattern should not be presented as the exemplification of some abstract grammar-rule, but as a way of saying something .

一个新句型的呈现方式不该是某种抽象文法规则的例示，而应该是「述说某事的一种方式」。

To exert oneself physically or mentally in order to do, make, or accomplish something.

创造，实现：尽力使用自己的体力或脑力以便做、干或完成某事

Exert oneself to do sth.

努力，尽力做某事 268。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。