但完成该过程，你不能缺少一台叫做‘压电式换能器’的设备。
To do all this, though, you need a device called a transducer.
现在它是一件轻而易举的跨越国界，但驾驶缺少的东西。
Now it is a breeze to drive across borders but something is missing.
作为一条普遍规律，是的：戴眼镜会令你看上去更聪明但更缺少魅力。
As a general rule, yes: glasses make you look smarter but less attractive.
我们有足够的能力，但缺少一点信心。
但一旦坐下，代谢过程就因缺少此重要物质而减缓。
When you sit down, an important part of your metabolism slows down.
但一旦坐下，代谢过程就因缺少此重要物质而减缓。
When you sit down, an important part of your metabolism slows down.
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