e able to 强调某种能力,而can只有“道义”上是否能够去做的意义.
i am not able to touch it我没有能力去碰它【是够不着,还是另有隐情?】
i cannot touch it我不能碰它【似乎是有人规定“我”】
问下be not able to/be unable to/can't 有什么区别
2个回答
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