Noun:

1. the front part of the head or skull (including the forehead)

Sinnan.豹夜蛾属sinn.原罪v.犯罪；违反(教规)sino- western art exchanges中西美术交流Sinotubimorpha guangdongensisn.广东管形藻Sino - Vietnam border trade中越边境贸易Sino-Foreign Communications中外交往Sino-Kazakhstan cooperation中哈合作sino-atrial conduction time窦房传导时间sinistral strike-slip motion左旋走滑Sino-- Russia relationship中俄关系Sino-Vietnamese relationship中越关系Sino-Soviet Joint Communique中苏联合公报