Ectotroph
外养寄生物
🗣️ 情景例句
I think it will let up in a little while.
我想马上就会停的。
The problem is far from easy.
这问题绝非易事。
What will be the population of these countries by the end of the twentieth century?
到20世界末较发达国家的人口将是多少？