[become invalid;discard as useless;be nullified;cancel;make null and void] 因失效而废弃;弃置不用 [way of doing or making a thing;method of work;practice] 做法 .
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make null and void
使无效
以上为机器翻译结果，长、整句建议使用 人工翻译 。
All these things, since they are false and empty, make vows null and void.
所有这些事情，因为他们是虚假的，空洞的，作出承诺无效。
youdao
So in theory if cross-default or accelerated payment clauses were unexpectedly to turn up in bond documentation, the Greek parliament could legislate to make them null and void.
BBC: Is a Greek default so bad for Greece?
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