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adjectival nouns or quasi-adjectives (keiyodoshi), nouns which may take the genitive case particle 'no', noun (common) (futsuumeishi)
single, simple, sole, individual, unitary
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ねじ、てこ、くさび、滑車などは単一機械と呼ばれる。
The screw, the lever, the wedge, the pulley, etc. are called simple machines.
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