She looked up with a concerned air.

她以关心的神情抬头望了望。

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She looked up with a concerned air.

她用关心的神情抬头看了看。

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Coiler can volume is concerned with coiler can size. The diameter of air vent is a critical factor in designing the can size. Coiler can volume can reach its maximum of some value.

条筒容量的大小与条筒尺寸设计有关，气孔直径起重要作用，只有当其取某一适当值时，条筒容量才达到最大。

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Everyone concerned with indoor air pollution, health, natural resources in the developing world and global warming has a stake in these questions.

FORBES: Where There's Smoke, There's Fire: A Call to Action for Better Indoor Air Pollution Research