滑翔机驾驶员利用上升暖气流在空中停留更长时间。

The glider pilot stayed aloft longer by catching the ___thermals.

他穿上保暖内衣准备去滑雪。

He put on his ___thermals before going skiing.

这种特殊材料具有良好的隔热性能。

This special material has excellent ___thermal insulation properties.