And scientific evidence suggests there are only small differences between the use of both types of needles. Niehaus explains.
Niehaus解释，科学证据提示两种针之间只有很小的区别。
And scientific evidence suggests there are only small differences between the use of both types of needles. Niehaus explains.
Niehaus解释，科学证据提示两种针之间只有很小的区别。
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