Definition: to step badly and almost fall over Level: C2
玛丽在松动的石头上绊了一下。
Mary ___stumbled on the loose rocks.
我的阁楼太暗了，我绊了一下摔倒了。
My attic was so dark that I ___stumbled and fell.
他在马路牙子上绊了一下，但迅速恢复了平衡。
He ___stumbled over the curb but quickly regained his balance.
