用作表语
▲S+be+～+prep.-phrase
Whether or not we arrive on time is contingent on the weather.我们能否准时到，要视天气好坏而定。
Such risks are contingent to the travel.这类危险在旅途中可能会发生。

contingent, accidental, adventitious, casual, fortuitous, incidental
参见accidental条。