我们以D.D.A.条款发货，这意味着关税需要由客户自行支付。

We shipped the goods under ___D.D.A. terms, which means the customer must pay the import duties.

这个游戏引擎使用D.D.A.算法来高效绘制直线。

The game engine uses the ___D.D.A. algorithm to draw lines efficiently.

地区发展局正在规划一个新的商业区。

The ___D.D.A. is planning a new commercial district.