一ひとつには

expression

for one thing; one reason is

Used to introduce one reason or factor among several, often followed by another reason introduced with また or もう一つには.

• 一ひとつには、時じ間かんがなかったからです。

  For one thing, I didn't have time.

• 一ひとつには値ね段だんが高たかいし、もう一ひとつにはデザインが気きに入いらない。

  For one thing, it's expensive, and for another, I don't like the design.