onsetKK [ˋɑnˏsɛt] /ˈɑnˌsɛt/發音名詞1開始、來臨、初期多指不好的事With the onset of winter, heating costs rose sharply.冬天一來,暖氣費用就大幅上漲。2發作、發病醫學The onset of the illness is usually sudden and painful.這種疾病的發作通常又突然又疼痛。3攻擊、進攻舊式The old walls could not withstand the enemy's onset.那些舊城牆擋不住敵軍的進攻。