①If trees are felled, they are cut down.【v.砍伐，砍倒(树木)】
②If you fell someone, you knock them down, for example in a fight.【v.击倒;打倒】
①Badly infected trees should be felled and burned.
②A blow on the forehead which felled him to the ground.
关于“砍伐”，这里再补充一个短语：chop down 【If you chop down a tree, you cut through its trunk with an axe so that it falls to the ground.】
Sometimes they have to chop down a tree for firewood.
这里再顺便补充一个关于“fell”的短语：in/at one fell swoop 一下子; 一举 【If something is done in one fell swoop or at one fell swoop, it is done on a single occasion or by a single action.】
In one fell swoop the bank wiped away the tentative benefits of this policy.
If someone goes somewhere and you tag along, you go with them, especially when they have not asked you to.
①I let him tag along because he had not been too well recently...
②She seems quite happy to tag along with them.
《经济学人》一篇关于日本奥林匹克的文章 Olympic gory 也出现了这个表达：
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