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number (of long, cylindrical things, movies, trains, home runs, etc.)
電車の本数が少ない。
There are few trains.
この路線はバスの本数が削減された。
The number of buses on this route has been cut.
一日に走る電車の本数が少ないと不便に感じる。
If there are few trains running per day, it feels inconvenient.