1.wreak v．发泄(to cause the infliction of vengeance)；引起(to bring about, to cause)
例：The thief wreaked his vengeance on Mary by destroying her house.
例：Victors in ancient Greek Olympic Games received cash prizes in addition to their laurel wreaths.
3.wreck n.失事船只(shipwreck)；残骸(the broken remains of something wrecked or otherwise ruined)
例：The coast guard is conducting tests to see whether pigeons can be trained to help find survivors of wrecks at sea.
4.wrestle v．摔跤；搏斗(to fight)；深思(to engage in deep thought)
例：Scientists are wrestling with the study of a new kind of star.
例：Is this line parallel to the y-axis?
6.yeast n.酵母(a yellowish surface froth or sediment that occurs especially in saccharine liquids( as fruit juices) in which it promotes alcoholic fermentation, consists largely of cells of a fungus (as the saccharomyces, saccharomyces cerevisiae), and is used especially in the making of alcoholic liquors and as a leaven in baking)
例：Yeast is used to leaven bread.
7.yen n.日元(Japanese money) ‘
例：The United States attempts to deal with the fall of the dollar against the yen.
8.yield n．产量（the amount or quantity produced or returned）；v．产生(bear, produce)；屈从(to give way to pressure)
例：The yield of natural gas from Norway's Troll gas field is expected to increase annually until the year 2005. //They discuss how such two methods have yielded contradictory data.