Unknow
vt. 不知道或不了解
🗣️ 情景例句
Philip was a young doctor,
Philip当时是个年轻的大夫
Give never the wolf the wether.
莫把阉羊送给狼。
Many firms, for instance, have great difficulty in obtaining technical or scientific books from libraries
比如，很多公司向图书馆借阅科技书籍时感到很困难，