?? 詞語組成解析
leg
[l?ɡ]
n. 腿;支柱，支架;褲腿;一段賽程;
vi. <口>走，跑;
exercise
['?ks?sa?z]
n. 練習;運動，訓練;運用;典禮;
vi. 鍛煉，訓練，練習;
vt. 鍛煉（身體某部位）;使焦慮，使憂慮;實行，發揮（作用）;運用;
ex出+erc力量+ise表名詞，物品，狀態 →練習，鍛煉
??? 情景例句
How often do you go running?
你多久跑步鍛煉一次？
Fortunately,I jumped back in time to avoid being hit.
幸好,我及時跳回來避免被撞擊。
Most people believe that the strike will last for at least a week.
多數人認為此次罷工至少會持續一個星期。