open mouth
The mouth being open. Only use when sufficiently open to (theoretically) see inside.
If the mouth is only slightly parted use parted lips.
The opposite of this is closed mouth.
另请参见
嘴巴张开。仅当足够打开以（理论上）看到内部时才使用。
如果嘴巴只是稍微张开，则使用张开的嘴唇。
如果嘴巴只是稍微张开，则使用张开的嘴唇。