thermal|thermals

滑翔机借助上升的暖气流在空中盘旋。

The glider circled in the ___thermal to stay airborne.

他穿上保暖内衣准备去滑雪。

He put on his ___thermals before going skiing.

冬天跑步时我总会穿保暖内衣。

I always wear ___thermal underwear when running in winter.