Their standard of living bumped along without any significant increase.他们的生活水平没有大的提高，只是略微上下波动。The result was a seesaw motion.结果呈现上下波动。Body temperature can fluctuate if you are ill.人患病后体温可能会上下波动。Cholesterol levels in the blood fluctuate in the course of a day.一天内血液中的胆固醇含量会上下波动。