1. The main complicating facts of human life must remain unintelligible.
    人类生活中最为主要的日趋复杂的现实就难以理解。

2. Until we are intelligent as to its laws and varieties, the main complicating facts of human life must remain unintelligible.
    直到我们理解了风俗的规律性和多样性，我们才能明白人为生活中主要的复杂现象。