最近有证据指出，45亿年前太阳系形成的时候，彗星有液态的核。
Recent evidence suggests that when the solar system formed 4.5 billion years ago, comets had liquid cores.
本研究旨在构建具有猪 MSTN 前肽基因定点突变的真核表达载体。
This research intended to construct a eukaryotic expression vector with a site-directed mutation of porcine MSTN propeptide gene.
几乎就在五年前，美国国会削减了一种引起争议的掩体核弹——坚实型核钻地弹——的研究经费。
Almost five years ago, America's Congress cut research funding for a controversial bunker-busting nuke called the Robust Nuclear Earth Penetrator.
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