Noun:

1. an earphone that is inserted into the ear canal

2. a plug of cotton, wax, or rubber that is fitted into the ear canal for protection against the entry of water or loud noise

EARSabbr.电声额定系统(=Electro-Acoustic Rating System)；n.耳朵（名词ear的复数形式）；【报刊】报头小栏，报耳earn.听觉；耳朵；倾听n.麦穗vi.抽穗eardiae surgery心脏外科ear bone mallet耳用鼓锤ear-appealingadj.悦耳的；好听的ear thermometer耳温枪ear mirror rack耳镜架eareinogenicity致癌ear to row test一穗一列检定Earias vittellan.翠纹钻夜蛾ear instruments耳科手术器械earphone socket耳机插孔

1. Luckily we took earplug with us, as the traffic outside our room was very noisy.
   真幸运，我们带有耳塞，因为房间外面的车辆噪音太大。