This shoe does not seem to pair up with that one.

这只鞋似乎与那只不成双。

The universe has cooled to about 1,000C - cool enough for electrons to pair up with nuclei to form the first atoms.

此时宇宙已冷却到1000摄氏度，温度低到电子开始登场并结合原子核形成大量的原子。

The universe has cooled to about 1, 000C - cool enough for electrons to pair up with nuclei to form the first atoms.

此时宇宙已冷却到1000摄氏度，温度低到电子开始登场并结合原子核形成大量的原子。

In rich countries the advantages that wealthy parents pass to their offspring begin with the sorting mechanism of marriage, in which elites increasingly pair up with elites.

在富裕国家中，有钱的父母传递给后代的优势，始于婚姻的门当户对机制。