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

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。