mutual attraction的用法和樣例：
例句
- Any two masses, regardless of size, exert an attraction on one another.
任何兩個質體，無論大小都會互相吸引。 - The tweezer array showed successfully that the same attraction that occurs between a pair of similarly charged particles is also present in large clusters of them.
光鉗陣列成功地顯示出，帶同性電的粒子群之間，也會發生如同一對帶同性電粒子之間互相吸引的現象。
