1. the number of persons ⇒にんずう(人数)
    • 頭数を数える
    • count 「the number of persons [heads]
    • 頭数を増す[減らす]
    • increase [decrease] the number
    • もし鈴木君が来ないとチームの頭数がそろわなくなる
    • If Suzuki doesn't come, we won't have enough players to make up a team.
    • 頭数が2名足りない
    • We are two men short of the required number.
  1. the number of heads
    • 羊の頭数を数える
    • count sheep