So, if a sequence of bytes could be a pointer to a piece of allocated memory, it marks it as being referenced.
所以，如果一个字节序列可以是一个指向一块被分配的内存的指针，那么收集器就将其标记为正在被引用。
Using a local variable declared inside a sequence of instructions that is referenced only once.
在指令序列中使用仅引用一次的局部变量。
There will be times when you model sequence diagrams that an interaction occurrence will overlap lifelines that are not referenced in the interaction occurrence.
有时候，你为一个序列图建模，其中交互进行会重叠没有在交互进行中引用的生命线。
There will be times when you model sequence diagrams that an interaction occurrence will overlap lifelines that are not referenced in the interaction occurrence.
有时候，你为一个序列图建模，其中交互进行会重叠没有在交互进行中引用的生命线。
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