Planting trees
在坑里插入一根长而粗的棍子。
knock sth. into… 把……插进（钉进）……，knock at (on) 敲……；另外knock into可以表示“碰撞”解。例如：
Don’t knock the nail into the chair.
不要把钉子钉进椅子里去。
Listen! Someone is knocking at (on) the door.
听！有人在敲门。
The young man knocked into me yesterday.
昨天那年轻人撞了我。
5. Made sure that it is straight.
确保树是直立的.
make sure表示“弄确实；核实；查证”。make sure常用于祈使句，后面常接that宾语从句或of介词短语。Make sure + that从句意为“弄明白；确信”。Make sure + of + 代词/名词，意思也是“弄明白；确信”。例如：
— Make sure of his coming before you set off.
— I make sure (that) he would come.
— 出发之前要确定他是否来。
— 我确信他会来。
另外，be sure + 不定式大多数情况下也用于祈使句，表示“务必；一定要；不要忘记”。
例如：
Be sure to come to our party if you have time.
如果有时间的话请一定来。
Be sure to finish the work as soon as possible.
请务必尽快完成这项工作。
6. Tie the tree to the top of the stick to keep it straight.
把树系在棍子的顶部让他直着。
(1) tie v.“系上”；n.“领带，领结”；tie…to…意为“把……系在……”。
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：
You'd better keep your room clean. 你最好使你的房间保持清洁。
Don't 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 the match.
好几百人观看比赛。
（2）plant / grow
这两个动词都有“种”的意思，区别如下：
1) plant“种植”，及物或不及物均可，常指移植已长成秧苗的植物，可用于“plant+场地+with”结构。如：
They planted trees in the garden. = They planted the garden with trees. 他们在花园里种树。
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