如何使用 "expensive" 造句

1. Why is tuition so expensive today ?
为什么现如今学费这么贵?
2. The surge itself was expensive .
增兵本身就很昂贵。
3. We gave them expensive and often irrelevant economic advice .
我们向他们提出代价高昂、却往往不切实际的经济建议。
4. Expensive things don 't create lasting happiness and security .
昂贵的东西无法带来持久的幸福和安逸。
5. Such lessons are both difficult and expensive to teach .
这样的课教起来既困难重重又价格不菲。

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