Isotopes
n. 核素；同位素（isotope的復數）
??? 情景例句
Off-season clothes are usually sold at very attractive prices.
換季衣服的售價通常挺吸引人。
The tortosis wins the race while the hare is sleeping.
兔子睡大覺，烏龜才得勝。
It's about a hundred metres along on the right.
再沿右邊邊走大約100米。