up-and-down

adj.

上上下下的；起伏的；来来往往的；变动的

1. All over the ship the bulkheads sweated a film of oil and water.
   船里上上下下的舱壁到处沾着一层油水。
2. The landscape is made up of low, rolling hills.
   此地的地貌为低矮起伏的丘陵。
3. She watched the gentle rise and fall of his chest as he slept.
   她看着他睡着时微微起伏的胸膛。
4. He put up a notice about the change in price.
   他张贴一则有关价格变动的布告。
5. New words and meanings keep the English language in a state of flux.
   新的字和新的字义使英语处于不断变动的情况中。

Up and down
Staircase bioassay: the up-and-down method.
Up-and-down regulation of skeletal muscle acetylcholine receptors. Effects on neuromuscular blockers
The Up-and-Down Method with Small Samples*
Advances in and limitations of up-and-down methodology: a precis of clinical use, study design, and dose estimation in anesthesia re...
Improved up-and-down designs for phase I trials.
Comparison of the up-and-down, conventional LD50, and fixed-dose acute toxicity procedures.
Dose finding using the biased coin up-and-down design and isotonic regression
The up-and-down of hepatic stellate cells in tissue injury: apoptosis restores cellular homeostasis
Non-Parametric Up-and-down Experimentation