滑翔机乘着温暖的上升气流翱翔，在天空中优雅地盘旋。

The glider soared in the warm ___updraughts, circling gracefully in the sky.

炉子里的火焰因为烟囱中的强烈上升气流而燃烧得更旺。

The flames in the furnace grew stronger due to the powerful ___updraughts in the chimney.