医生有时开比较便宜的非注册商标的药品，而不开比较昂贵的品牌药。

Doctors sometimes prescribe cheaper generic drugs instead of more expensive brand names.

《柯林斯英汉双解大词典》

确实，方法调用通常是比较昂贵的操作。

Indeed, method calls are usually fairly expensive operations.

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同时，它也是比较昂贵的。

But it's also expensive.

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