idiomatic phrase的用法和樣例：
例句
- Idiom refers to a phrase whose meaning is different from the meanings of each word considered separately.
習語，在英語中指那些意義不同於字面意義的固定短語，在漢語中指四字格成語。 - An idiom is a phrase refined from a longtime use with the features of conciseness, metaphor and penetration, etc.
習語是經過長時間的使用而提煉出來的固定短語或短句，它一般具有文字簡練，比喻形象，含義精闢等特點。
