discourage
单词辨析：
使某人失去信心或泄气。
One failure after another discouraged him a lot.
接二连三的失败让他非常灰心。
How can you let one failure discourage you?
你怎么能失败一次就泄气了呢？
使某人对某事物心生畏惧或信心不足，通常用被动语态。
He has never been daunted by difficulties.
他从未被困难吓倒过。
She felt daunted by the prospect of studying abroad.
她一想到要出国留学就感到害怕。
指使人心情不好、不高兴。
Losing his job really depressed him.
丢了工作让他很沮丧。
That book depressed him.
那本书让他看得心情郁闷。
指使人失去信心或泄气，常可与 demoralize 换用。
Don't let one failure discourage/demoralize you! You can do it!
别失败一次就灰心！你能行的！
She is easily discouraged/demoralized by obstacles.
她一遇到阻碍就泄气。
较正式用词，指使人失去希望和信心。
Don't let the defeat dishearten you! Remember that Rome was not built in a day.
不要因为失败而灰心！要知道成功不是一蹴而就的。
相关例句：
Discourage unsustainable agricultural practices, uncontrolled deforestation, destructive fishing practices and overfishing;
阻止不可持续的农业活动、未加控制的毁林活动、破坏性捕捞活动和过度捕捞；
The methods he used to discourage poaching.
他用以阻止偷猎的办法。
Subsidies on rice exports by industrial countries also discourage higher production in low-cost countries.
各工业国对大米出口的补贴也抑制了低成本国家提高生产。
The slower appreciation against the dollar could be a signal to discourage speculators.
人民币对美元升值的放缓，可能是阻止投机者的一个信号。
We discourage smoking in this school.
我们在这所学校劝阻吸烟。
I think we should discourage people from using their cars.
我认为我们应该减少其使用的汽车的人。