书籍 Headway - 中上级 - 日常英语（第九单元）

to make a low sound that often expresses pain, grief, or disappointment

呻吟, 抱怨

to make a deep, low sound, typically expressing pain, despair, or disapproval

呻吟, 哼哼

experiencing great sadness, shock, or disappointment

沮丧的, 感到失望的

to accept something to be true even without proof

相信, 认可

to be understandable in a way that is reasonable

treating everyone equally and in a right or acceptable way

公平的, 公正的

an activity or situation that does not produce any benefit or value, and instead consumes time and resources that could be better utilized elsewhere

浪费时间, 时间的浪费

to stop being harsh or strict with someone

impossible or very hard to control

an uneasy feeling that we get because of our own or someone else's mistake or bad manner

羞愧, 羞耻

causing slight anger

恼人的, 烦人的

to feel regret or disappointment in oneself for a past mistake or missed opportunity

to start becoming a source of trouble or worry