PREP阅读中的一句话读不懂~~麻烦XDJM帮个忙啊

hwwxhxx

More selective than most chemical pesticides in that they ordinarily destroy only unwanted species, biocontrol agents (such as insects, fungi, and viruses) eat, infect, or parasitize targeted plant or animal pests.  However, biocontrol agents can negatively affect nontarget species by, for example, competing with them for resources
in that后面的they是指代的biocontrol agent吗？这段话我读得很凌乱，麻烦帮翻译一下啊~谢谢啊！！
另外顺带问一下~阅读资料就OG和PREP就可以了不~偶尔做做GWD~行不啊。。还有十天考试！

hwwxhxx

通了！谢谢啦~

datlantis

相较于普通的专杀型杀虫剂，biocontrol agents 更有选择性，它们可以缠噬，感染或者寄居于指定的植物或动物害虫。 但是，BA也能反过来也会影响非指定的物种，比如与某些非指定物种争夺资源的情况下。

我不太会翻译， 就说个大概    in that 后面的they 是指的前面的most chemical pesticides, 整个in that后面是在解释前面的这个most chemical pesticides来作为和后面BA 比较