对失踪飞行员的安全甚为担忧: grave fears are felt for the safety of the missing airman
痛快: 1.(高兴) very happy; delighted; joyful 短语和例子感到痛快 be filled with joy; 图一时的痛快 seek momentary gratification2.(尽兴) to one's heart's content; to one's great satisfaction 短语和例子吃个痛快 eat one's fill;