Mdd
abbr. microgram per square decimeter per day 微克/分米/天（腐蚀速率单位）
🗣️ 情景例句
Spring has sprung and all the flowers are blooming.
春天来了。花儿都开了。
I'm afraid I spilled coffee on the tablecloth.
对不起，我把咖啡洒到桌布上了。
It is not long before they are so accustomed to swimming that they can pick up weights from the floor of the pool.
他们很快便适应了游泳，以致能捡起池底的物品。