The disease is spreading with alarming rapidity.

　　這種疾病正在以令人吃驚的速度蔓延。

　　The rainforests are disappearing at an alarming rate.

　　雨林正以驚人的速度消失。

　　The disease has spread at an alarming rate.

　　這種病以驚人的速度傳播開來。

　　Once events are safely in the past, this idea seems to become less alarming

　　一旦那些事件塵封為歷史，這個想法似乎就變得不那么可怕了。

　　There was no time to launch the lifeboats because the ferry capsized with such alarming speed.

　　渡輪瞬間傾覆，根本沒時間放救生艇下水。