unnecessary suffering

• 不必要的痛苦

unnecessary suffering的用法和样例：

例句

1. Some waste, diversion, and corruption are inevitable, but if these problems are severe they may lead to discontent and unnecessary suffering by the population.
   一定程度的浪费，转移，和腐败是不可避免的，但如果这些问题严重的话就会导致人们的不满和不必要的痛苦。