To improve concurrency, PostgreSQL uses the Lehman, Yao variation of B-trees, which lifts this requirement and thus allows sparse indexes.
Lehman还建议大众适当降低期望值,大众期望值过高可能是由于以往的疫苗效果出众所导致的。
But Lehman also suggests that the public's expectations may be too high, fueled as they are by the knowledge that other vaccines are so effective.
此外,Stanley和Lehman发现,目前人工智能不能复制人类识别有趣路径的自然能力。
Furthermore, Stanley and Lehman have found that replicating this natural human ability to identify paths that are interesting is currently impossible with artificial intelligence.
Christopher Lehmann, Senior Regional Director for Counter-Terrorism and Asia/Pacific Programs, Office of Prosecutorial Development Assistance and Training, Department of Justice, United States of America.
Lehman在现职上仍然分管上述事务,同时负责全球沟通、企业品牌、全球企业捐助以及患者互动。
In his current role, Lehman continues to oversee these functions and also has responsibility for global communications, corporate branding, global corporate giving, and patient engagement.
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