回答

・abacus

「珠算」可以表述為abacus。

abacus 的意思是「計算機、算盤、東方算盤」

The reason I am good at mental arithmetic is that I used to take abacus lessons.
我之所以擅長心算，是因為我以前學過珠算。

I took abacus lessons, so I am confident that I can do calculations faster than anyone else.
我上過珠算課，所以我有信心我能比其他人更快地計算。

有幫助｜0