n.嚴肅；認真；嚴重性
Humor must have its background of seriousness. 幽默必須以嚴肅為背景。
Jack's countenance assumed an air of seriousness. 捷克裝出認真的表情。
His tone contained the right mixture of banter and seriousness. 他的口氣是半戲謔半認真的。
