专家级：表明该计数器可能只对最高级的用户有用。
Expert: Indicates that this counter is likely to be useful only to the most advanced users.
高级：表明该计数器可能只对高级用户有用。
Advanced: Indicates that this counter is likely to be useful only to advanced users.
当较高级（第 1 级或第 2 级）垃圾回收发生时此计数器被显式递增。
This counter is explicitly incremented when a higher generation (generation 1 or 2) garbage collection occurs.
当较高级（第 1 级或第 2 级）垃圾回收发生时此计数器被显式递增。
This counter is explicitly incremented when a higher generation (generation 1 or 2) garbage collection occurs.
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