懸而未決

hang in the balance
    未見分曉，安危未定
    hang in the balance or be in the balance means （of a decision, result, somebody's future, etc.） be uncertain or undecided，（指決定、結(jié)果、某人的未來等）不能確定的，尚未決定的。
    我們來看兩個(gè)例句：
    The future of this project is hanging in the balance.
    這項(xiàng)目的下一步仍然懸而未決。
    After the surgery, the patient became very sick and her life hung in the balance for nearly a week.
    手術(shù)后，那個(gè)病人非常虛弱，將近一個(gè)星期他的生命在垂危中。