Definition: to not be able to do something Level: B1
我昨天无法通过电话联系到她。
I was ___unable ___to reach her by phone yesterday.
她太紧张了，以至于无法回答问题。
She was so nervous that she was ___unable ___to answer the question.
没有签证，你将无法进入这个国家。
Without a visa, you will be ___unable ___to enter the country.
