On the one hand, if the body doesn't have enough cholesterol, we would not be able to survive. On the other hand, if the body has too much cholesterol, the excess begins to line the arteries.

一方面，如果身体没有足够的胆固醇，我们将无法生存；另一方面，如果体内胆固醇过多，多余的胆固醇就开始让动脉变厚。

《柯林斯英汉双解大词典》

There is no human supervision, but an attendant will be on hand to accept cash and explain the system to newly users.

这里没有人工监督，但会有一名服务员在现场接受现金，并向新用户介绍系统。

youdao

There is a price to be paid in that it is a delicate crop that cannot be lifted by machine or it will be bruised and rot, so has to be hauled by hand which is expensive.

这是要付出代价的，因为这是一种脆弱的农作物，不能用机器采摘，否则就会被压伤和腐坏，所以必须采用手工拖运，这是非常耗钱的。

youdao

If there is a large supply of seeds, then hand-operated presses may not be enough to support a business.

VOA: special.2009.09.29

And some of them might be spinning clockwise, in which case, according to the right-hand rule we would consider them spin-down.

而另一些电子则是在顺时针自旋，在这种情况下，根据右手定理,我们会以为它是在向下转。

麻省理工公开课 - 固态化学导论课程节选

Why don't we have you, when the time comes, raise your hand if you're supposed to be representing a one?

为什么让家上来呢，如果你代表1，就举起你的手？

哈佛公开课 - 计算机科学课程节选

Ms Velmi added she wanted the ramps to be rolled out across the whole network, for trained staff to be on hand to use them, and for longer term changes including raised platforms to follow.

BBC: London Underground disability ramps to stay after Games

We were invited to participate by the program directors, and as such, provided the Chief Medical Officer of our Cardiac Rhythm Management Division and several engineers and quality assurance experts to be on hand to answer questions and present requested information.

FORBES: St Jude Medical Statement on the Riata ICD Lead Summit

Commonwealth Games medal winners are expected to be on hand to explain how their sport works.

BBC: Youth airgun marksman