There are idioms about flu recently.

I have the flu recently-mixed feelings.

Chef's specialty-oil and vinegar

Summer vacation is long, winter vacation is short-heat expands and cold contracts.

The doomsday scene of the earth-the seas run dry and the rocks crumble

Fly first, then take the subway-heaven goes to earth.

Sandals-unprecedented

Instill-bit by bit

Hope ~ give a reward ~