Did you ever use a gun like that?

你用过这样的大炮吗？

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You should learn to use a hammer before you pick up a nail gun. Likewise, you should become comfortable managing classes manually before you try to use more powerful tools.

在想要使用电动射钉枪之前要先熟练使用锤子，与此相似，在试图采用更强大的自动管理工具之前也要先能自如地手动管理这些类。

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He is hoping to use his crossbow during the next hunting season, as he has become tired of using a gun.

他希望在接下来的狩猎季节用十字弓狩猎，因为他厌烦用枪狩猎了。

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New York required mental health professionals to tell state authorities if a patient threatens to use a gun illegally.

WSJ: How Conn. gun bill compares to new NY, Colo. laws

Therapists, doctors and other mental health professionals will be required to tell state authorities if a patient threatens to use a gun illegally.

WSJ: NY to exempt TV, movies under state's new gun law

The statistics may show a drop in crime across the country in the past five years, including a drop in murders by gun-wielding teenagers, but the fact is that each year more than 2, 000 Americans aged 14-17 use a gun to kill someone.

ECONOMIST: The lesson nobody learns