The Gulf of Mexico oil disaster comes during spring spawning season, an especially bad time for aquatic life making them extraordinarily vulnerable to the toxic effects of the oil itself, says Doug Rader, chief oceans scientist for the Environmental...
Portfolio 精讲Portfolio Yang Li: 大家好我是杨莉,欢迎收听你问我答。Ive invited my colleague William to helpwith todays question about a difficult word. William: Hello Im William. Its good to be with you Li. Lets see what the questi...