yawn loudly
yawn deeply
a wide yawn
A: You yawned twice already!
A：你已经打两次哈欠了！
B: I'm sorry, I'm just very sleepy.
B：对不起，我只是太困了。
1) 打哈欠
2) 表现出无聊
3) 表现出疲倦
1. 张嘴打哈欠
verb
1. To open one's mouth wide and take a deep breath, often due to sleepiness or boredom.