合同可以是双边的或单边的.A contract is either bilateral or unilateral.开放是多边的,也是双边的.Opening - up can be both and multilateral.这种双边的对话体制框架本意存在.The institutional framework for this dialogue already exists....
大海一片蔚蓝，朵朵白云飘过。The sea was blue, and white puffy clouds sailed by.蔚蓝天空, 阳光灿烂.The sky is clear and blue, the sunlight dazzling.雪白的山峰同蔚蓝的天空交相辉映.This white peak contrasts finely with the blue sky....