1·Although most condoms contain spermicide, there are some manufactured without.
尽管大多数避孕套都含有杀精剂，但也有一些是不含的。
—— 《柯林斯英汉双解大词典》
2·However, spermicide on its own is actually a pretty poor method, so make sure you do combine them.
然而，实际上杀精剂本身就不是一个好办法，那么请保证将二者结合起来使用。