10. inexplicable adj. incapable of being explained or accounted for 难以或无法解释或说明的
eg: the inexplicable disappearance of some nonlocal seasonal women workers worried everyone.
派生词汇 inexplicability n. 不可解释性 inexplicably adv. 无法解释地
inexplicableness n. 费解 explicable adj. 可解释的
Exercise：
从以上单词中选出最恰当的词，填入空格内。
1. They are not familiar with the insurance against_____.
2. The merchants should not take advantage of the ____ of law to earn more money.
3. The peasants usually prepare_____ in autumn for winter to save money, for vegetables are expensive in the last season of the year.
4. Every schoolboy has one or two____ to accompany him in his activities.
5.the old man left house at three in the morning for____ reasons.
答案：
1. litigation 2. loopholes 3.pickles 4.cronies 5.inexplicable