原级：plain
比较级：plainer
plainest的解释
第三人称复数：plains
1. \u0039\u0031\u0031\u67E5\u8BE2\u00B7\u82F1\u8BED\u5355\u8BCD
1. The president laid out in some of his plainest terms yet how to determine when the US presence in Iraq has achieved its goals.