【上位】 a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion 伝えられた動きの速度または方向を変えるために、歯のついた別の装置に連結する歯車。
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【上位】 to close within bounds, limit or hold back from movement; "This holds the local until the express passengers change trains"; "About a dozen animals were held inside the stockade"; "The illegal immigrants were held at a detention center"; "The terrorists held the journalists for ransom" 限界内、制限内にとどめること、あるいは動きを制限する。
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