你的中文内容写得太深情了,太难翻译了,不过,参考译文如下:
Mathematicscannotcountyourcontributionsandchangesofseasonscannotfadeyouteachingwords.
Sir,wearedeeplygratefultoyouforyourteachingasifwealwaysrememberwatersourcewhenwedrink.We'llneverforgetyourmeaningfulteachingaswellasyourhoarsevoices.
Thewritingonthewoodwillbedispearedandthescriptsonthestonewillbeblurred,butyournamewillbedeeplyengravedinourhearts.Whenthetideisdown,shellsmakethebeachbeautiful.It'stimeforustoclosethismilitarydrill,pleaseacceptoursincerewishesforyou.
Nomatterwhereweareintheendsoftheearth,we'llnever,everforgetyourmeanfulteaching.Thankyou.Sir.