a person or thing that tests sth 试验者；检查者◆He started as a code tester for a software firm. 他最初是一家软件公司的代码检测员。◆The modem comes with a phone-line tester. 这款调制解调器带有电话线检测器。
a small amount of a product that you can try to see if you like it 试用品◆They are giving away thousands of perfume testers in their latest promotion. 他们在最近的促销活动中派发了上千份试用装香水。