learn to be grateful的意思是是什么

造句：

Do not learn to be grateful, do not know filial piety parents; If you don't learn to be grateful, you don't know to return to society; If you don't learn to be grateful, you don't know to do your duty.

不学会感恩,就不知道孝敬父母;不学会感恩,就不知道回报社会;不学会感恩,就不知道尽自己的责任。