完全钙化的脑膜瘤仍然可能是恶性的，虽然不常见。
A completely calcified meningioma may still be malignant, though uncommonly.
他们俩虽然不常见面，但一见面总是谈论过去的美好时光。
Whenever the two meet, which is not often, they talk of the good old times.
偏头痛比其它类型的头痛疾患得到更多研究，并且虽然不常见，仍获得许多注意。
Migraine has been more frequently studied than other types of headache disorder, and has received a lot of attention - though is less common.
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