She cut down the seedling with one chop.

她一刀就把小苗砍倒了。

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

这我砍了半小时, 但还未把它砍倒。

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

砍倒果烧, 这是杀取卵。