打哈欠真的會傳染嗎？ The Mystery of the Contagious Yawn

The man’s speech was so boring that I couldn’t help but yawn.
這位先生的演講很無聊，所以我忍不住打呵欠。

People often feel drowsy after eating lunch.
吃完午餐後，大家常會感到昏昏欲睡。
 

With the number of cars increasing on a constant basis, the police are having a hard time regulating traffic in the city.
由於車輛數目不斷在增加，警方在管理市區交通上遇到很大的麻煩。

Your health will be ruined if you do not regulate your life.
你生活再不規律點，健康都要給毀了。

This machine can automatically regulate the room temperature. 這臺機器可以自動調節室內的溫度。

People with COVID-19 symptoms should be quarantined because the virus is highly contagious.
有新冠肺炎症狀的人須被隔離，因為這種病毒極具傳染性。

The medical community is sparing no effort to promote human health.
醫學界正不遺餘力提升人類的健康。

Many people in the community joined the festival.
社區裡有許多人參加了這項節慶活動。

This watch is equipped with a delicate timing mechanism.
這只手錶配備有精細的計時機械裝置。

Government officials are setting up new mechanisms to help the unemployed.
政府官員正在建立新制度來幫助失業民眾。

Government officials are setting up new mechanisms for helping the unemployed.
政府官員正在建立新制度來幫助失業民眾。

A feeling of physical pain serves as a natural defense mechanism.
肉體的痛覺是天生的防衛機制。

On Christmas Eve, the children were on the alert for any sign of Santa Claus.
在耶誕夜，孩子們隨時注意聖誕老人出現的蛛絲馬跡。

Police officers are always alert to possible danger.
警察對可能發生的危險隨時保持警覺。

We should alert everyone to the dangers of smoking.
我們應該提醒每個人警覺抽菸的危險。

We should awaken everyone to the dangers of smoking.
我們應該提醒每個人警覺抽菸的危險。

The dust in the air triggered David's allergy. 
空氣中的灰塵引發大衛過敏。

The policeman negotiating with the gunman asked him to remove his finger from the trigger.
警察和持槍者談判，要求他把手指從板機上移開。

Fireworks displays and thunder are common triggers for anxiety among combat veterans.
煙火和雷聲是引起老兵們焦慮的常見因素。