星号表示所有进程的read系统调用都应该探测。
The asterisk indicates that the read system call for all processes are to be probed.
建议您用双引号将跟踪屏蔽括起来，以免操作系统shell对星号发生错误判断。
It is recommended that you enclose the trace mask with double quotation marks to avoid possible misinterpretation of the asterisk character by the operating-system shell.
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