While the said derrick being subjected to a lifting test with the original approved S.W.L. of 3 tons, the brake of the winch had without effect.是什么意思_While the said derrick being subjected to a lifting test with the original approved S.W.L. of 3 tons, the brake of the winch had without effect.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句