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Our class is composed of eighteen boys and twelve girls.
我们班由18个男生和12个女生组成。
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The university is composed of five academic schools.
整个大学由5个学院组成。
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The band is composed of many famous musicians.
乐队由许多著名乐师组成。
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All animals and plants are composed of cells.
一切动植物均由细胞组成。