still fresh in one's memory 记忆犹新
advance in sequence 循序渐进
be hardworking with no complaints 任劳任怨
refuse to play second fiddle 不甘示弱
to know like the back of one's hand 了如指掌
to combat the cause of a disease or problem( instead of treating just the symptom)治本
by oneself 自行
suffer losses 吃亏
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