alarming=worrying=disturbing 令人担忧的

It is alarming that students spend so much time learning without actually learning something.

at an alarming rate/speed

The Chinese sturgeon is disappearing at an alarming rate.

The Amazon rainforest is disappearing at an alarming rate.

Even by the standards of poor countries, India is alarming-and unnecessarily-filthy. It needs to clean up.

Domestic violence is alarmingly widespread in Turkey.

翻译：It is alarming that the suicide rate in the US has been increasing these years.

The suicide rate in the US has been increasing at an alarming rate.

参考：The US has been an alarming increase in suicide in the past few years.

It is particularly disturbing that suicide has been on the rise in America in the last few years.

It is particularly worrying that a growing number of Americans have taken their own lives over the past few years.

造句：It is alarmingly that more and more young people in China tend to get married later and get divorced quicker.

spend time/energy doing sth

Engineers spend much time and energy developing brilliant solutions.

Stacey spends all her free time painting.