And even if there are no bugs today (unlikely), a maintenance change or a change in the environment may introduce a bug later on.

而且，即使今天没有任何缺陷(不太可能)，日后维护的改变或者环境的改变都可能会引入缺陷。

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That suggests even if this virus becomes a pandemic, it need not be a deadly one-early intervention may well quash the bug.

这意味着，就算这种病毒在全球范围内泛滥，那也不会具有致命性：因为提前治疗很可能会击退该病毒。

youdao

In this case a particular test run is hard to reproduce and the same test case may expose a bug only occasionally.

在这种情况下，只运行一个测试很难重现，相同的测试用例可能会偶然地暴露出一个bug。

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