A study of doubly charged ion mass spectra (2E spectra), the substituents effect and the target gas pressure deppendence of biphenyl derivitives was presented in this work.

本文研究了联苯取代物双电荷离子2E谱及其取代基效应和靶气压力影响。

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An optical waveguide environmental sensor is provided that is capable of detecting a target gas or liquid in the ambient environment in an advantageously short period of time.

提供了一种光波导环境传感器，其能够在有利短的时间内检测出周围环境中的目标气体或液体。

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Will China at a certain point in the future accept the greenhouse gas emission target jointly set by the international community?

中国将来会不会愿意接受国际社会共同确定的温室气体排放目标？

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Many nations have pledged to reduce greenhouse gas emissions, but are falling short of the target reduction of 25 to 40 percent of 1990 levels.

VOA: standard.2009.09.28

And, furthermore, they are characteristic of the target gas element.

更进一步的说，它们是目标气体元素的特征。

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The risks of a spill are lower because the target is primarily gas, and the shallow water depth (approx. 100 ft) allows the blowout preventer to be located on the rig at the surface.

FORBES: Go Shallow For Oil Spill Stocks

All four except Alaska also had the more stringent greenhouse gas reduction target.

FORBES: Water Risk Threatens Businesses, National Security

Arkansas, Iowa, Missouri, Montana, Texas, and Utah do have greenhouse gas pollution reduction plans, and Utah also has the more stringent greenhouse gas reduction target.

FORBES: Water Risk Threatens Businesses, National Security