adv.不規(guī)律地;不定地;飄忽不定地,不穩(wěn)定地
Beacuse of trafficc jam, the car is moving erratically and slowly. 由于交通堵塞,公交車(chē)不規(guī)律地向前移動(dòng),而且速度非常的慢。