我们并不希望允许终端使用者直接地存取实体变数或者某个特定实作的细节。
We don't want to allow access directly to the Instance Variables or to the specific implementation details.
实作会验证传入的实体是否被追踪。
The implementation verifies that the passed-in entity is tracked.
普通名词作定语、普通名词和“（一）量名”词组作谓语都不指称实体，而表示所修饰或说明的名词的性质，是非指称性成分。
When the common nouns and the "(yi)+M+N" phrases act as attribute and predicate, they don't refer to any entity, but indicate attributes.
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