最新研究發(fā)現(xiàn), "U.S. obesity rates are leveling off after decades of skyrocketing growth," 幾十年急劇攀升后,美國人的肥胖率開始穩(wěn)定下來。但與此同時(shí),"Although heart disease death rates have been falling in the U.S. for four decades, they are now leveling off for young men and women," 雖然美國心臟病死亡率四十年來一直下降,但是年輕男性和女性的心臟病死亡率的下降趨勢正在慢慢停下來。好的,今天我們學(xué)習(xí)的詞是level off...