Was this designed, or did it just happen ? 这是预先计划的呢,还是偶然发生的?
Some liabilities are contingent . 有些债务是偶然发生。
Only occasionally a hubbub of altercation rises to the skies . 只是偶然发生口角,大声地吵闹。
Except for one minor incident, he seemed to be in excellent health . 他除了偶然发生过一次小病外,似乎非常健康。
The theory is an effort to generalize about relationships that occur regularly, not about coincidental happenings . 该理论致力于概括某些规律性地发生的关系,而不是论述那些偶然发生的关系。