arduously

The soldiers marched arduously through the deep snow and freezing wind for three days.

(Chinese) 士兵们在深雪和寒风中费力地行军了三天。

The researchers worked arduously to find a cure for the rare disease before winter.

(Chinese) 研究人员在入冬前为寻找这种罕见病的疗法而辛勤工作。