If an assertion is found to be false, any messages within the instance sequence diagram are void and the scenario will not occur.

如果发现断言为假，实例序列图中的所有消息都为空，这种情形将不出现。

youdao

The XMLEXISTS is a Boolean function that takes an XPath expression as input and returns FALSE if the XPath expression returns an empty sequence and TRUE otherwise.

XMLEXISTS是一个Boolean函数，它接受一个XPath表达式作为输入；如果这个XPath表达式返回空序列，它会返回FALSE，否则返回TRUE。

youdao

Once the predicate returns false, it stops taking from the sequence.

一旦断言返回false，它就停止从这个序列中获取。

youdao

There seems to have been a sequence of technical faults (reportedly, a problematic transformer, false alarms, failed signals and an apparent power surge) at about the same time in a small area of the power grid serving London.

ECONOMIST: Power industry