Ferns
n. 蕨类；蕨类植物（fern的复数形式）
🗣️ 情景例句
I know, Grandpa.
我知道 ，爷爷。
A bird is known by its note, and a man by his talk.
闻其歌知其鸟，听其言知其人。
of supplying sufficient details to enable the thing to be constructed.
而且向它提供制造核弹的细节，