They never startled one robin by being sudden enough to seem dangerous or threatening.
它们从不会很突然吓到一只知更鸟，让它们好像觉得危险或受到威胁。
I have never heard of a human being who was strong enough for it.
我从来没有听过有一个人是强大得可膺此任的。
It could end up just never being attractive enough.
它可能最后不再具有吸引力。
It could end up just never being attractive enough.
它可能最后不再具有吸引力。
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