Amniocentesis is the removal of fluid from the amniotic sac.羊膜穿刺术是从羊膜囊抽取羊水的技术.The heart sounds are muffled when the pericardial sac is distended with fluid.当心包充满液体时心音减弱.Starch grains present in the embryo sac and placent...
他喋喋不休地说着某个无聊的电视连续剧。He was carrying on about some stupid television series.事情变得有点沉闷无聊的时候，不要胆怯。Don't be faint-hearted when things seem a bit slow or boring.会议变成了无聊的扯皮。The meeting degenerated into petty squabbling....