When the expression is evaluated, the variable $file contains the name as it was found on stdin, and for convenience the variable $_ is also set to the same value.
在评价表达式时，变量 $file 包含了可以在 stdin,中找到的名字，出于方便考虑，变量 $_ 也被赋予相同的值。
shown in Listing 5. For convenience, the XDEBUG_PROFILE parameter is set within the form in a hidden variable.
为方便起见，将 XDEBUG_PROFILE 参数设置在表单的隐藏变量内。
For experiment convenience, we describe the video sequence in this paper as gray scale random variable, and explore fully its statistical characteristics.
针对某一类视频序列，为方便实验起见，把图像序列用灰度随机变量来描述，对其进行仿真并研究其统计特性。
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