1.She cut down the seedling with one chop.

1.她刀就把小苗砍倒。

2.I've been chopping away for half an hour but the tree is still standing.

2.这我砍半小时, 但还未把它砍倒。

3.Cutting down fruit trees for firewood is a case of killing the goose that lays the golden eggs.

3.砍倒柴烧, 这是杀鸡取卵。