矢

Each subject's average monthly sulfur dioxides, nitrogen dioxide, ozone, carbon monoxide, particulate matter with aerodynamic diameter of less than10μm (PM10) exposure estimates during pregnancy were caculated.

利用2000至2002年的空气品质监测资料，计算研究对象受孕前一个月至分娩期间不同时期的周遭空气中悬浮微粒、二氧化硫、二氧化氮、臭氧、及一氧化碳等污染物的暴露情形。

We must weigh one plan against another in order to arrive a conclusion.

在得出结论之前，我们必须仔细权衡一项计划与另一项计划的优劣。