三光气作为剧毒的光气和双光气在合成中的替代物，不但毒性低，使用安全方便，而且反应条件温和、选择性好、收率高。
The triphosgene, being as the substitute for phosgene and diphosgene in synthesis, is not only low-toxic but also safe and convenient to use with mild conditions, good selectivity and high yields.
尽管毒性有所不同，但毫无疑问的是它们都是带有剧毒的。
All known pit vipers are venomous, although their potency varies across species.
本目录所称剧毒化学品是指具有非常剧烈毒性危害的化学品，包括人工合成的化学品及其混合物（含农药）和天然毒素。
The highly toxic chemicals mentioned in the Catalogue refer to those with acute toxic hazard, including the manually synthesized chemicals and their mixtures (including pesticides) and natural toxins.
本发明用固体光气代替了一级剧毒性气体――光气，便于准确计量，优化了操作条件，对环境污染小；
The present invention uses solid phosgene, rather than phosgene to result in accurate metering, optimized operation condition and less environmental pollution.
本发明用固体光气代替了一级剧毒性气体――光气，便于准确计量，优化了操作条件，对环境污染小；
The present invention uses solid phosgene, rather than phosgene to result in accurate metering, optimized operation condition and less environmental pollution.
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