BYA：十亿年前

英文缩写词BYA的例句

1. A billion years ago, the Moon was much closer to Earth than it will be tonight.
2. 十亿年前(BYA)，月球与地球之间的距离可比今晚它俩之间的距离要近得多。
3. Yet oxygen gas did not begin to accumulate in the atmosphere until about 2 billion years ago.
4. 但是大约在20亿年前，氧气才开始在大气层中积累。
5. Today, scientists think that the sun, the earth, and the other planets in our solar system were formed at least five billion years ago ( 1 ).
6. 现在，科学家认为，我们太阳系中的太阳、地球和其他行星，至少是在五十万年以前形成的。
7. Some researchers have suggested that impacts on the moon began to taper off4.3 billion years ago, only to resume with a vengeance in a " cataclysm " 400 million years later.
8. 一些研究者认为，冲击对月球的影响开始削弱始于43亿年前，直到4亿年以后才从这个“大灾难”中恢复来。
9. Life seems to have originated in the primordial oceans that covered the Earth four billion years ago.
10. 生命看来似乎起源于40亿年前覆盖着地球的原始海洋。