Doctors are worried about the possible spread of the disease.

　　醫生擔心這疾病可能會蔓延。

　　Back at home, her parents were worried.

　　在家中，她的父母很擔心。

　　There was a worried expression on her face.

　　她臉上流露出擔心的神色。

　　They are worried about prospective changes in the law.

　　他們擔心即將修改法律。

　　Talk to your doctor if you're still worried.

　　如果你仍然不放心，就找醫生談一談。