可疑来源

sustainable source───可持续资源

reliable source───可靠来源

questionable───adj.可疑的；有问题的

questionableness───质疑性

unquestionably true───毫无疑问是真的

unstoppable force───势不可挡

ignition source───[电]点火源；着火源

Where the validity of the examinations already performed may be questionable because of an identified source of error the tests shall be repeated after exclusion of that cause.───当已经完成的检测的有效性被质疑，因为识别了错误的根源，那么这个测试应该被重复，在排除了该错误原因后。

source of some norms and a few questionable points are briefly introduced and discussed.───介绍了有关规定的来源，简要讨论了有关规定的疑难点。