However，silk wasn't the only thing passed along the Silk Road；anything had buyers was traded along the road.

然而，通过丝绸之路的东西并不仅仅是丝绸，任何有买家的东西都可以通过这条路销售出去。

重点词汇

1．Air­conditioned vehicles for observing animals.

供观察动物用的空调车。

[归纳拓展]

observe vt.观察，观测；遵守、奉行(法律、习俗等)；庆祝(节日)

observe sb.do sth.看到某人做某事

observe sb.doing sth.看到某人正在做某事

observe that...看到，观察到......

注意：observe用于被动语态时，作主语补足语的不定式须带to。

[语境助记]

(1)Always observe district fire bans.(2015·江苏)

一定要遵守区域火灾禁令。

(2)His neighbor observed a stranger enter his house and take away some valuables.

他的邻居看见一个陌生人进入他家，拿走了许多贵重物品。

(3)He observed a stranger hanging around the store.

他看到一个陌生人在商店附近闲逛。

[题组训练]

(1)写出下列句子中observe的汉语意思

①Do you observe Christmas Day in your country？

②The players agreed to observe the spirit of fair play in all of the games.

③He made a telescope through which he could observe the stars.

(2)用所给动词的正确形式填空

①When I passed his house，I observed him (play) in his yard.

②He was observed (hurry) by.

③It is everybody's duty (observe) them to keep our society in order and going on the right track.(2015·江苏)

④ (observe) carefully if any change occurs when doing experiments in the lab.

2．Disadvantages of US trip