Both of which are miserable objects to encounter, let alone use near the eye.

看起来像是中世纪武器和现代牙科工具的完美结合，两者都是用于战斗的可怕物体，更不用说靠近眼睛了。

youdao

However, I still stay in the superficial phase of study, acquiring knowledge, never think about them let alone use them.

可是自己还是停留在第一阶段——闻。自己很少去思考自己学到的这些知识，更别讲去运用这些知识了。

youdao

But such beneficial exchanges occur more by chance than design. Because most water use is not measured, let alone priced, trade rarely reflects water scarcities.

但是此类有益的交流更多的是出于偶然，而非处于策划——因为大部分水都未曾经过测量，更不用说标价，因此水匮乏无从体现。

youdao

To figure out even what this thing is, let alone how to use it properly. So, you know, I'm sympathetic.

就连认出这是什么东西（都很困难），更别说正确应用它了，所以我很同情这点。

经常犯的失误 - SpeakingMax英语口语达人

I barely know how to use a cell phone let alone a computer, you know,

我勉强会用手机，更不要说电脑了，你知道，

现在的孩子好可怕 - SpeakingMax英语口语达人

Like Lisette was going to remember this name, let alone use it.

NEWYORKER: I.D.

Best Buy : People can hardly keep up with the newest technological equipment, let alone how to hook it up and use it.

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But many companies do not yet have an energy strategy, let alone broader sustainability strategies to manage the use of water, land, and other resources.

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