Legal efficacy is the condition of the legal effect, but legal effect is the source of the legalenforcement.
法律实效是法律效力的条件，法律效力是法律实效的源泉。
2
These authors focus primarily on differences in the legal systems and strength of legalenforcement across different countries, although their intuition and model is motivated at the firm level.
尽管他们的直觉和模型都来自于企业层面，这些作者首先关注的是国家之间法律系统和执法力度上的差别。
3
However, the Justices said that Arizona police would be allowed to verify the legal status of people who come in contact with law enforcement.