Máfan shì jiēzhǒng ér zhì, ràng tā bù zhī suǒ cuò.
Problems came one after another, leaving him at a loss.
Tips
memory
接 (follow) + 踵 (heel of the foot) + 而至 (and arrive): picture people arriving so close together that each person's toes touch the heels of the one ahead — a vivid image of non-stop arrivals.