生物学上的假设包括生态变化，这些变化是由昆虫和开花植物之间的共同进化，或海洋中以海底生物为食的捕食者的进化所带来的。

Biological hypotheses include ecological changes brought about by the evolution of cooperation between insects and flowering plants or of bottom-feeding predators in the oceans.

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石英是石英——由四个氧离子围绕的硅离子——200万年前的更新世石英和5亿年前的寒武纪石英之间没有任何区别。

Quartz is quartz—a silicon ion surrounded by four oxygen ions—there's no difference at all between two-million-year-old Pleistocene quartz and Cambrian quartz created over 500 million years ago.

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最常见的空间是那些由松散的、未固结的砂和砾石组成的颗粒（沙粒和小卵石）之间的空间。

The commonest spaces are those among the particles—sand grains and tiny pebbles—of loose, unconsolidated sand and gravel.

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And then the potential energy, the energy is stored here due to the coulombic force of attraction between the electron and the nucleus.

然后说势能,位能其实就是,由电子和原子核之间的库仑引力而形成的能量。

麻省理工公开课 - 固态化学导论课程节选

And, that's given by the balance between the attractive force of the ions offset by the repulsive force in the electronic shells.

而那是由,在离子的电子层之间的,引力和斥力相互抵消得到的。

麻省理工公开课 - 固态化学导论课程节选

The story in Exodus has high drama, and lots of folkloric elements including this contest between Moses and Aaron on the one hand and the magicians of Egypt on the other hand.

出埃及记》中的故事很有戏剧性，有很多民间传说的元素,由摩西和亚伦之间的较量,以及与埃及巫师的争斗。

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