I visit them not infrequently.
我经常拜访他们。
He often leaves me alone at home, at least not infrequently.
他常常留我独自在家，这情况不是不常见。
Those estimates are right so infrequently that they're not worth the trouble.
这类估算很少是正确的，以致于得不偿失。
Those estimates are right so infrequently that they're not worth the trouble.
这类估算很少是正确的，以致于得不偿失。
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