He buy a duty-free watch at the airport or he buy the watch duty-free.
他在机场买了一块免税手表或他买的手表是免税的。
Captain: I will monitor his watch duty.
船长：我将监督其职责。
Some men had the duty; many just off watch were fast asleep.
有些人正在值班，也有很多刚刚离岗的人正在熟睡。
The lab must work out the principle of duty, the watch must check up the power, the water pipe, the window and the door to make sure the lab is safe.
实验室应建立安全值班制度，值班人员应负责锁门、检查电源、水管、门窗等，以确保安全。
No man could say the watch had done more or less than its duty.
没有人能对这块表的报时说长道短。
No man could say the watch had done more or less than its duty.
没有人能对这块表的报时说长道短。
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