您仍然还有一种选择：您可以通过托管服务执行测试。

You do still have one other option: you can use a hosted service to do the testing for you.

youdao

还有一种选择是，检查不变量以确保类型强制转换将会成功。

Alternatively, examine the invariants to ensure that the casts will succeed.

youdao

现在，我们还有一种选择：那就是以市场为导向的留人策略。

Now, we have a choice: that is attractive to market-oriented strategy.

youdao