once in a while[英][wʌns in ə hwail][美][wʌns ɪn e hwaɪl]时不时，偶尔，间或; 例句:1."We used to think of pressure as this random acute phenomenon that happened everyonce in a while. 约翰•汉姆表示：“我们以前认为，压力是随机出现的危急现象，只会偶尔发生。 2.Taking a real vacation once in a while is also a proven stress fighter. 隔一段时间真正休一次假也被证明是缓解压力的有效方法。
