以工业机器人的IP67防护为例，陆上机器人通常只需通过实验室测试，在标准工况下喷水30分钟达标即可。但水面机器人需要在不同水质、不同水温、不同流速中长期运行，腐蚀、生物附着、密封老化都是必须蹚过去的工程难题。这些并没有现成的供应链可借鉴。
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Although the homeownership rate among single women dipped last year from about 51.9% to 50.9%, that hasn’t stopped more than 20 million single women from becoming homeowners, a record high.