■ ear

同 eye 一样，这个名词，用于表示肉体器官，通常按照实际情况决定单复数。

• The ball dropped down past his right ear and into the neck of his shirt.小球掉下，经过他的右耳，掉进他的衬衣领。
• He has big ears.他耳朵大。

但是，表示较为抽象的“听觉”，常常用单数。

• pleasing to the ear悦耳的
• grate on the ear刺耳
• play an instrument by ear靠听背弹奏乐器
• have a good ear for music有音乐听觉
• have a good ear for languages有学语言的敏锐听力
• lend a ear to somebody倾听某人
• have somebody's ear使得某人言听计从。

但是，作“听觉”解，也有用复数的。

• come to somebody's ears传到某人的耳朵里
• fall on deaf ears石沉大海，说了没人听。