on the ground of造句

No plea can be set up on the ground of ignorance.
以无知为理由而提出的抗辩是不能成立的.

He left on the ground of ill.
他以生病为理由离开了.

The youngster has been excused by the law on the ground of his youth.
这个青年由于年轻而受到法律的赦免.