Many young people in the West are expected to leave _ could be life's most important decision -marriage-almost entirely

问题描述:

Many young people in the West are expected to leave _ could be life's most important decision -marriage-almost entirely up to luck 为什么填what?

what 等于 the thing that,带进去就通了吧请问整句话该如何理解?很多西方的年轻人被期望把人生最重要的决定——婚姻几乎完全归结于运气。