On this day, day and night all over the world are equal length.

在这一天，世界各地的白天和黑夜都一样长。

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At each equinox, the sun crosses the Earth's equator, making night and day of approximately equal length on most of the planet.

在每一年的春分点上，太阳横跨着地球上的赤道，使得地球上大部分地区的白天和夜晚的时间接近相等。

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It was only at two points in the year that the night and the day were of equal length and that was at the spring or fall equinox.

一年之中只有两次，白天和夜晚的长度一样，即春分和秋分。

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And now you have a tetrahedron with equal length bonds.

四面体型的四根等长的键。

麻省理工公开课 - 固态化学导论课程节选

What we're going to do in forming a molecule is just bring these two orbitals close together such that now we have their nucleus, the two nuclei, at a distance apart that's equal to the bond length.

我们在形成一个分子时要做的就是,把这两个轨道放到一起,这样我们有他们的原子核，两个原子核，它们之间的距离为键长。

麻省理工公开课 - 化学原理课程节选

Overall, therefore, men tend to have longer ring fingers than index fingers, whereas in women the two fingers are more likely to be of equal length.

ECONOMIST: Autism

The court heard the baby's fracture healed and within a few weeks his leg seemed to be equal in length to the other.

BBC: Newtown father jailed for breaking baby son's leg

And so what I'm trying to make sure of is that when I put the pen up against the control box, the length of the pen exposed at each end is equal.

NPR: Memoir Offers an Inside Look at Autism