corrosive

n. caustic course of treatment,painful rem-edy (usually in medicine);(fig.) something that eatsinto the mind痛苦的治疗过程，苦药；（比喻）使心里难受的事。
△2H.VI.3.2.403:“Away! Though parting be a fret-ful corrosive./It is applied to a deathful wound.” 走吧！ 虽然离别是一服令人难咽的苦药，但它适于治疗致命伤。

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corrosive

a. fretting,wasting,aggravating令人苦恼的，令人憔悴的，使事情恶化的。
△1H.VI.3.3.3:“Care is nocure,but rather corrosive / For things that are not tobe remedied.”对于无可挽回之事，悲伤也于事无补，只是使人苦恼而已。