My wrist watch is set five minutes ahead, but I know this so every time I look at it I subtract five minutes in my head, which means there's no point setting my watch ahead.
ーMy wrist watch is set five minutes ahead, but I know this, so every time I look at it I subtract five minutes in my head, which means there's no point setting my watch ahead.
「腕時計は５分進めてあるが、このことを知っているので、時計を見るたびに頭の中で５分引いてしまう。だから時計を早める意味がない。」
wrist watch で「腕時計」
set five minutes ahead「５分早くセットする」
subtract で「引く」
ご参考まで！
カナダ 
