621是介于620与622之间的自然数、奇数、合数。也是第621个正整数。
羽博YB-621 Yoobao YB
莱茵LM-621 Lane LM
Bisphenol-A epoxy resin 621 双酚A二缩水甘油醚
Bisphenol-A diglycidyl ether 621 双酚A型环氧树脂
I spent much of what I laughingly call "the vacations" working through 621 pages of typescript.
我把我戏称为“假期”的大部分时间都花在那621页的打字稿上了。
Last week, France announced that the country will pave 621 miles of road with solar panels over the next five years, with the goal of providing cheap, renewable energy to five million people.
上周，法国宣布将在未来5年内铺设一条长达621英里的太阳能公路，以期为500万民众提供便宜的可再生的能源。
人口：621760(49位)。
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