更新する u
保安システム s
正面玄関 m
On Friday, a company called SSS will be upgrading the security system at the main entrance.
金曜日に、SSSという会社が正面玄関の保安システムの更新作業を行います。
Optimized studying based on the forgetting curve vastly improves memorization. - What is reminDO?
Memorize