The number of reported crimes is increasing at an alarming rate.
报警案件的数量正在以惊人的``速度增长。
The speed at which cities are growing in the less developed countries is alarming.
欠发达国家城市发展的.速度令人担忧。
The disease is spreading with alarming rapidity.
这种疾病正在以令人吃惊的速度蔓延。