艰巨的

The general assigned him to do the tough task.

将军派他去完艰巨的务。

He shrank from a hard task.

他害怕艰巨的务。

Tell us how you fulfilled the heavy task ahead of schedule.

"告诉我们,你们是怎样提前完一艰巨务的。"

The country faces a huge task of national reconstruction following the war.

战后，该国面临着重建家园的艰巨务。