She tied his horse to a tree by the road.
他把马拴在路旁的一棵树上。
She bought a tie for her husband yesterday.
她昨天给她丈夫买了条领带。
(2) to keep it straight 是动词不定式，在句中作状语，表示捆树的目的。keep it straight 为“动+ 宾 + 宾补”结构，如：
Youd better keep your room clean. 你最好使你的房间保持清洁。
Dont touch the machine. You must keep yourselves away from any danger. 别动机器，你该保证自己的安全。
7. But more “Great Green Walls” are still needed, and not only in China.
但是，更多的绿色长城仍旧需要，这不仅在中国。
not only 能常和but also连用，意思是“不但……而且……”，可以连接两个主语、谓语、宾语等，当连接两个主语时，谓语动词应和第二个主语在人称和数上保持一致，also往往可以省略。例如：
She is good at not only dancing but (also) singing. She is both a dancer and a singer.
她不但善长跳舞，而且善长唱歌。（连接两个宾语）她是个舞蹈家和歌唱家。
Not only you but (also) your sister has to get to school on time. Being on time is a must.
不仅你而且你妹妹都得按时到校。守时是必须的。
8. Many thousands of trees must be planted every year.
每年必须种植成千上万棵树。
（1）thousands of这种类型的结构前面已讲述过，它的前面不可用具体的数字，可用不确定数目的修饰语，如some, many, several等。
Some hundreds of people watched t
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