Map and grep evaluate a block or an expression for each element of a list.
Map和grep对列表的每个元素计算块或表达式。
The standard exploration procedure here has been to block out areas on the magnetic map.
这里的标准勘探程序是先在磁异常图上画出这个地区。
The standard exploration procedure here has been to block out areas on the magnetic map.
这里的标准勘探程序是先在磁异常图上画出这个地区。
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