A transport and delivery system for nanogram quantities of molecular species that does not use microfluidic channels, pumps, or valves is described.

本文介绍了一种不需要微流体通道、泵或瓣膜的纳克量分子运输和递药系统。

The density of invasive plant species declined from the southeast coast inland to the northwest, which was best explained by transport density.

各省外来入侵植物物种密度由东南海岸向内陆递减，造成这一趋势的主要影响因素为交通密度；

Production needs a large quantity of species of lotus, transport troubles, higher costs.

生产时需要的种藕量大，运输麻烦，成本较高。

The model couples continuity equation, momentum equation and species conservation equations. Net water transport flux in the membrane is considered as a boundary condition.

模型耦合了连续方程、动量方程和组分守恒方程，并将质子膜中的净水迁移通量作为边界条件之一来处理。