vacant line
常見例句
- A plausible reason is that all the dinosaurs had been killed off, except the line that evolved into birds, and the placental mammals speciated into the ecological niches that had been left vacant.
一個(gè)可能的原因是所有恐龍除進(jìn)化為鳥的一支外都死掉了，胎盤類哺乳動物才在被空閑出來的生態(tài)龕中得以進(jìn)化。 返回 vacant line