ㄐㄧˊㄈㄥjífēngzhīㄐㄧㄥˋㄘㄠˇjìngcǎo

疾风知劲草
  1. 只有猛烈大風才能知道堅韌比喻艱苦危難才能考驗意志堅強 疾風知勁草烈火」。

the storm put strong grass to the test (idiom)​; fig. troubled times test a faithful minister, to show one's true colors after a stern test, also written 疾風勁草