常見例句雙語例句If it slowly drops and does not run out through Test Cock No. 2, then No. 2 ball valve has a small leak, but No. 1 check valve is tight.如果水柱慢慢下降，并且沒有從測試旋塞2號流出，則2號球閥有點泄漏，但是1號止回閥密封緊密。 返回 test cock