Everybody was worrying about his fragile health.

大家都替他的身体忧心。

What will happen if sudden surges in the number of people requiring care for influenza push already fragile health services over the brink?

如果大量感染流感的人群出现在卫生服务系统已经脆弱到接近崩溃的地区，将会发生什么？