He shouted at his brother, his neck veins bulging.他朝他的兄弟吼叫，脖子上青筋暴突。My mother has had unsightly varicose veins for years.我母亲多年来一直患有难看的静脉曲张。It works only in the veins, where the blood flow is slower.它只在静脉里起作用，在静脉中血液流动更慢一些。...
One end of the see - saw goes up while the other end goes down.跷跷板一头起来,另一头就下去.Prices see - saw according to demand.物价随需求变化而反覆涨跌.Changing demand causes a see - saw in prices.需求不断变化造成价格反覆涨跌....