When invoking unknown code (which listeners certainly qualify as), it is prudent to execute it in a try-catch block so that ill-behaved listeners do not do more damage than necessary.

在调用未知代码(侦听器就是这样的代码)时，谨慎的方式是在try - catch块中执行它，这样，行为有误的侦听器不会造成更多不必要的破坏。

youdao

Its way more M2M than is necessary, but it certainly does the job of giving the best of them.

它的道路上获得更大的m2 m比是必要的，但它的确给了他们最好的工作。

youdao

Not necessary, certainly, but after more than a century of intermittent ethnic strife in Ulster, and the past 30 years of sustained violence, not entirely surprising either.

ECONOMIST: Beyond Omagh