They identified four different lead-based substances, two of which were man-made, not natural.
他们鉴定出四种不同的含铅物质，其中两种是人工合成的，并非天然物质。
This has lead to your current electronically based human civilization.
这导向你们当前电子基础上的人类文明。
The lead based paint might protect it from radiation too!
表面那层漆可能也可以保护（吸收）雷达波！
The lead based paint might protect it from radiation too!
表面那层漆可能也可以保护（吸收）雷达波！
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