Couplet
n. 對句, 對聯
?? 牛津釋義
couplet
n
two successive lines of verse of equal length 相連的兩行長度相同的詩句; 對句
a rhyming couplet 押韻的對句.
??? 情景例句
It was a gradual process, involving many factors.
這是個漸進的過程，涉及到方方面面。
The effect speaks, the tongue needs not.
事實勝于雄辯。
a wave length (the horizontal distance between two wave crests),
波長（兩個浪峰間的水平距離）