根据母羊出生类型来早期选择产活羔数是无效的。

Early selection for number of lambs born alive based on ewe birth type was ineffective.

youdao

无效的字元可能是在这个方法的引数中，或在先前已写入至缓冲区的方法的引数中。

The invalid character might be in the argument of this method or in an argument of previous methods that were writing to the buffer.

youdao

一些容器，如滴眼液的塑料包装可能不需要最初清洗， 因为可能由于粒子数增加导致无效。

Some containers, e. g. plastic containers for eyedrops may not need an initial rinse, indeed this may be counter-productive since particulates counts could be increased as a result.

youdao

Well, simply with the * notation at least on the way in when you declare the function called swap, you simply say this is not going to take an int and another int because that's useless.

好的，简单说，当你声明一个函数调用swap函数时,使用*符号，你可以简单说，这不能使用一个int数和另外一个int数,因为那是无效的。

哈佛公开课 - 计算机科学课程节选