这个跟踪以根集 开始，它由一些内部结构组成，比如线程栈和对象的全局引用。
This tracing starts with the root set, which consists of internal structures such as thread stacks and global references to objects.
如果解剖尸体，或是通过手术查看胃的内部结构，它就像一个袋子一样，表层由一系列的看得见的褶皱组成。
If you look inside a stomach when dissecting a cadaver, or during an operation, it appears like a bag whose surface is thrown into a series of visible folds.
“这些玻璃碎渣的组成结构相当罕见”他说道，“它们不是(月球)内部结构的主要组成部分。”
"These glass fragments are quite exotic in their composition," he says. "They don't represent the majority of the interior."
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