n.打呵欠;
adj.张着大嘴的,打哈欠的;
v.打呵欠( yawn的现在分词 );张开,裂开;
例句:
Yawning and headache are the most common adverse reactions.
打瞌睡,头痛是本品最常见的不良反应.
I felt so sleepy I couldn't stop yawning.
我感到很困,止不住地打呵欠.
She kept yawning as a hint that she was tired.
她不断打呵欠,暗示她累了.