词汇	國難當頭
释义	國難當頭变体国难当头
随便看	underflowing irrigation underflow interception water source site underflow locus under-fives Under-five-year under five years underfix under-flame underflavored underfleece underfleshed underflood underfloor under-floor under-floor-air conditioning system underfloor air distribution Under-floor air distribution underfloor air distribution system underfloor air distribution system plenum underfloor air supply under floor air supply under-floor air supply under-floor air supply system underfloor amplifier underfloor amplifier line transmission system