Visitors touring the factory floor must wear a hard hat at all times.

參觀工廠廠區的訪客必須全程戴著安全帽。

Please pack a sun hat, since the company picnic will be held outdoors.

請帶一頂遮陽帽，因為公司野餐會在戶外舉行。

A passenger left a gray hat on the bus, so customer service is holding it.

有位乘客把一頂灰色帽子遺留在公車上，所以客服中心正在代為保管。