表扬是孩子良好行为的重要强化因素。

Praise is an important ___reinforcer for children's good behavior.

老师用贴纸作为孩子完成作业的奖励物。

The teacher used stickers as a ___reinforcer for the child's completed homework.

玻璃纤维常被用作混凝土的增强材料以提高其抗裂性能。

Fiberglass is often used as a ___reinforcement in concrete to improve its crack resistance.