1. The geologist needs to know what rocks the drill has reached, so every so often a sample is obtained with a coring bit.
    地质学家需要知道钻头已达到什么样的岩层了, 所以时时要用取钻芯头那样.

2. The geologist needs to know what rocks the drill has reached, so every so often a sample is obtained with a coring bit.
    地质学家需要知道钻头已以到达什么样的岩层，因此时常要用芯钻头取样。

3. After that ill-fated trip to New York, Engelbreit sent a sample of her drawings to two greeting-card companies.
    那次倒霉的纽约之行后，恩格尔布赖特把她的画样寄给了两家贺卡公司。

4. And how could you prevent someone from taking a sample of your hair and making a clone of you?
    而且，你怎样防止别人从你的头发里取得样本来克隆一个你呢？