再次失败的想法可能会让他气馁，不敢再尝试。

The thought of failing again might ___discourage him from trying.

高昂的票价可能会让潜在的游客望而却步。

High ticket prices can ___discourage potential visitors.

积极的反馈鼓励创新，而不断的批评往往会扼杀它。

Positive feedback encourages innovation, while constant criticism tends to ___discourage it.