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.
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.
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