Data about the moon's composition, such as how much ice and other treasures it contains, could help China decide whether its plans for a future lunar base are practical.
关于月亮构成的数据，比如它含有多少冰和其他宝藏，有助于中国决定未来的月球基地计划是否可行。
Food pressers also make practical use of carbohydrate composition data.
食品加工者也把碳水化合物组成的知识用于实际工作。
Piano improvisatory accompaniment is not only a subject including composition and performance but also a practical performing art.
钢琴即兴伴奏既是一门融创作与演奏为一体的综合学科，同时又是一门实用性很强的表演艺术。
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