Closed-chain compound

closed [klozd]

adj. 关闭着的，封闭着的;密闭着的，保密的;<美>准备好了的，定了契约的; v. “close”的过去式和过去分词;

clos=close关闭+ed已...的→关闭了的

chain [tʃen]

n. 链子，链条;连锁，连续;拘束;连锁店或旅馆系列的事物; vt. 用铁链锁住;监禁，束缚;

compound ['kɑmpaʊnd]

n. 场地;复合物;（筑有围墙的）院子;复合词;

com全部+pound放→全部放到一起→化合物

The only entry requirement is a valid passort.

入境的唯一条件就是持有一本有效的护照。

An empty bag cannot stand upright.

空袋不能直立。

What about heart? Heart is what makes you love other people. You can love your friend, even though you don't agree with everything she or he says. So when you listen to someone, you should listen with complete attention, and with complete respect for

那么“心”字的意思是什么呢？“心”是指对别人的爱心。你能爱你的朋友，即使你并不同意他们所说的每一件事情。因此，当你听某人说话时，你要一心一意地听，对别人完全尊重。