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至適化 / してきか : 1）optimization 2）optimize (vs)
至適 / してき : adj-na 1）optimal 2）optimum
至要 / しよう : n 1）extremely important
至日 / しじつ : n 1）day of the solstice
至情 / しじょう : n 1）sincerity 2）genuine feeling
至急便 / しきゅうびん : n 1）express mail
至急 / しきゅう : adv n adj-no 1）urgent 2）pressing P
至心 / ししん : n 1）sincerity
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至適化

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