通过为顾客提供标准化的信封和信盒以及要求标签上标有一致的信息，这些公司建立起一套可靠的跟踪系统。
By providing standard envelopes and boxes to customers and requiring consistent information on the shipping label, these companies were able to build sophisticated tracking systems.
从理论上对信盒在螺旋滑道中的运动进行了分析，提出了螺旋滑道各设计参数间的条件公式，并绘出了参数曲线。
It gives a theoretical analysis to the motion of mail case in spiral slide, presents conditional formulas among the designing parameters of spiral slide, and draws parameter curves.
他拿出一个小首饰盒、一封信和三个信封。
He took out a small jewelry box, a letter, and three envelopes.
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