电子表格常常会过时、很不可靠，管理员无法确定电子表格是最新的，甚至无法确定它是正确的电子表格。
Spreadsheets are often out-dated and are unreliable, and administrators can never be confident that a spreadsheet is current or even that it is the correct spreadsheet.
无法保证终结器将在何时运行，或者甚至它是否会运行。
There is no guarantee when a finalizer will be run, or even if it will be run at all.
如果测试很复杂，以致于不能立即断定它是否正确，那么您将无法知道该测试是否因为是错误的测试(甚至更糟的是不知道它是否正被错误地传递)而导致失败。
If a test is so complicated that you can't immediately tell it's correct, you don't know whether it's failing because the test is bad or, even worse, whether it's passing erroneously.
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