Welsbach
burner韦耳斯拔煤气喷嘴
🗣️ 情景例句
Is he still in his office?
他还在办公室吗？
Do you think there is something wrong with the contract?
你认为合同有问题吗？
He has a bad cold,MR.Williams,
他得了重感冒，威廉斯先生，