pulley
n
1 (apparatus consisting of a) wheel or wheels with grooves for ropes or chains, used for lifting things 滑轮(组); 滑车.
2 wheel or drum fixed on a shaft and turned by a belt, used esp to increase speed or power 皮带轮.
The Native Americans caught and trained them and were then able to use them to carry their goods when they travelled from one camping ground to another.
美洲土著人捕捉野马,加以驯服。
It is much cheaper to post or email a long report than to fax it.
邮寄或电子邮递一封长篇报告比传真要便宜得多。
Von Frisch watched the wagging dance very carefully.