慢速英语:Two Inventions That Helped Level the Playing Field Against Bullets, Car Crashes

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例句：If you can't restrain your dog you must lock it up.
      如果你无法管住你的狗, 就必须把它关起来。

2.attachment n.附属物, 附件

例句：The vacuum cleaner has four different attachments.
      吸尘器有四个不同的附件。

3.secure vt.握紧; 关牢

例句：Secure the prisoner so that he won't escape again.
      严密监禁那个囚犯以免他再逃掉。

4.mushroom n.蘑菇；蕈；伞菌

例句：Some mushrooms are good to eat; some are poisonous.
      有些蘑菇可食用, 有些则有毒。

5.firmness n.坚定;坚决

例句：Love asks faith,and faith firmness.
      爱情要求信任,信任要求坚定。

6.defend vt.vi.保卫,防御；保护

例句：They defended very well in the game.
      在那场比赛中他们防守得很好。