multiply
单词辨析：
只限于指动物交配繁殖；也可指饲养、培育动植物。
Some animals breed very fast.
一些动物繁殖速度非常快。
Many families in the town become rich after they began to breed cattle and pigs.
饲养牛和猪以后，镇上的很多家庭都致富了。
通常指动植物或微生物繁殖。
Long-time exposure to the damp environment multiplies the bacteria in food rapidly.
长时间放置在潮湿的环境中使食物中的细菌迅速繁殖。
Rabbits multiply very fast.
兔子繁殖非常迅速。
指人或动物繁育后代。
They care about nothing except procreating.
他们关心的只是传宗接代。
Experts are doing research on animals' power to procreate their species.
专家正在研究动物繁衍后代的能力。
相关例句：
When these multiply and go on to infect new individuals, drug resistance spreads.
当这些寄生虫繁殖并感染新的个体的时候，耐药性就扩散了。
Such disputes multiplied in the eighteenth and nineteenth centuries
这类纠纷在18和19世纪大量增多。
These permutations multiply towards infinity
这些排列可以增加到无穷大。
OK, now we know how to multiply matrices.
好，现在我们知道怎么把两个矩阵相乘了。
If I multiply these two, what is the coulomb times a volt?
如果我把这两个乘起来，库仑乘以伏特是多少？
I don't know how to take two strings and multiply them together.
我不知道，怎么把两个字符串乘到一起。