Meadow voles do not form pair bonds.
草原田鼠却不会结成配偶。
What you used to do is, every six months you'd pull out your bonds and you'd clip the coupons with a pair of scissors; you take them to a bank and they would give you cash for your coupons.
过去,你每六个月从你的债券上,用剪刀剪下息票,把它拿到银行,用息票兑换现金。
So, using our simple valence bond theory, what we would expect is that we want to pair up any unpaired electrons in methane with unpaired electrons from hydrogen and form bonds.
利用简单的价电子成键理论,我们预计,要把所有甲烷中没有配对的电子,和氢原子中没有配对的电子配对来形成键。
And if we put that in our bond here, we have 1, 2, 3 bonds, plus we have one lone pair left over.
如果我们把它们放到键里,我们有1,2,3个键,还剩下一对孤对在这里。
If these bonds were all completely of equal distance apart, whether is was a lone pair or bonding electrons, 5° the angles would be 109 . 5 degrees.
如果不管它是孤对,还是成键,它们等距分开的话,键角是109。
What you used to do is, every six months you'd pull out your bonds and you'd clip the coupons with a pair of scissors; you take them to a bank and they would give you cash for your coupons.
过去,你每六个月从你的债券上,用剪刀剪下息票,把它拿到银行,用息票兑换现金
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