无形中wúxíngzhōng不知不觉的情况下;不具备名义而具有实质的情况下{in reality, not in name; imperceptibly; virtually; unnoticeably}: 小张～成了他的助手{Xiao Zhang has virtually become his assistant.}|大家三三两两地交谈着,～开起了小组会。{They chatted in twos or threes, and virtually fell into group meetings;}也说also无形之中{wúxíngzhīzhōng}。