utility ball
A large ball used in children's physical education.
Free from (optical) aberrations
(topology, of a subset of a topological space) Given a subset S of a topological space X, a point x whose every neighborhood contains at least one point distinct from x that belongs to S.
of
An (often handwritten) alphanumeric matrix proving paid postage, used in place of postage stamps.
体育の授業で、生徒たちは輪になって協調性を養うために大きな体育用ボールをやさしく回し合った。
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DiQt
Free
★★★★★★★★★★
