実践！英文速読 I-14

　Besides the intellect, the power of concentration is a very important quality,
which few people acquire except through education.

　スラッシュは前置詞の前、カンマの後に入れます。

　Besides the intellect,/ the power of concentration is a very important quality,
/ which few people acquire/ except through education.

「知性だけでなく、集中力もまたとても重要な資質だ、それを身につける人はほとんどいない、教育を通して以外で。」

　There are three qualities which distinguish perfect concentration from
imperfect concentration: perfect concentration should be intense,
prolonged and voluntary.

　スラッシュは関係代名詞・前置詞の前、カンマの後に入れます。

　 There are three qualities/ which distinguish perfect concentration/
from imperfect concentration: perfect concentration should be intense,/
prolonged and voluntary.

　「三つの特質がある、それは完全な集中力と不完全な集中力とを区別する、

　つまり、完全な集中力は強く、持続性があり、自発的であるべきだ。」