The students in the composition class were assigned the task of writing an essay on "the most beautiful thing I ever saw."

作文课上同学们在写关于“曾见过的最美的事物”的论文。

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The Aggregation property is important for complex types: it has to be set to Composition for attributes of a class type and Shared for attributes of metaclass or stereotype.

聚合属性对于复合属性集非常重要：它必须要为类的属性设置成 Composition 并且为元类的原型类型设置为 Shared 。

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Another important feature of composition aggregation is that the part class can only be related to one instance of the parent class (e.g. the Company class in our example).

组合聚合的另一个重要功能是部分类只能与父类的实例相关(举例来说，我们例子中的Company类)。

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He gave a composition master class to the students, and a couple of them came to our rehearsal last night and sat in the back, studying the score with him.

NPR: 'Chasing Light': Music Made For 50 States

Greece's next government, whatever its composition, cannot escape the growing resentment of the country's political class.

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Until detailed studies of the freshman class have been produced, commentators should be cautious about generalising about its racial composition and should certainly refrain from producing spuriously exact headlines about a 57% fall in the number of blacks being admitted to Berkeley.

ECONOMIST: Californian higher education