pair sb off with sb 将某人与某人配成一对
Her parents persuaded her to pair off with rich neighbour.
她的父母劝她嫁给有钱的邻居。
He's always trying to pair me off with his cousin.
他总想把我和他表弟配成一对。
In 1919, for example, a humpback whale with a pair of leglike appendages over a metre long, complete with a full set of limb bones, was caught off Vancouver Island in Canada.
例如,1919年,在加拿大温哥华岛附近捕获了一条座头鲸,它有一对长达1米多的腿状附肢,还有完整的整套肢骨。
So in terms of nitrogen that starts off with a valence number of 5, again we have 2 lone pair electrons in the nitrogen, and again, we have 6 electrons that are shared.
对于氮来说,我们应该从五个价电子开始,同样,氮也有两个孤对电子,共用电子的个数也一样,是六个。
So we would pair off students with Hispanic families in need,
我们会将他们与有需要帮助的拉美裔家庭结对,
For the sulfur, we start off with 6 valence electrons, minus 4 lone pair electrons, minus 2, taking in account our bonding electrons, so we end up with a formal charge of 0.
对于硫,我们从六个价电子开始,减去四个孤对电子,再减去二,算上我们的成键电子,因此最终我们有零个形式电荷。
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