🧩 词语组成解析
榆属
🗣️ 情景例句
taking a vacation together--with the family.
要一起渡个假， 全家一起。
He has been to America.
他去过美国。[曾经有过的经验]
It is bacteria that have generated the oxygen we breathe on earth.
正是细菌生产出我们在地球上呼吸的氧气。