Foods and fluids are mixed in the stomach by its muscular contractions.通过胃部肌肉的收缩食物和流质在胃中混合。Contractions are much more common in speech than in writing.缩略词在口语里比在书写中常见得多.Muscle contractions are powered by the chemical aden...
在生物学上,同种族生物数目越多,更加容易收到种族病毒的侵害.In biology a more homogeneous population is more susceptible to a genocidal plague.成年海豚企图杀死同种族的刚出生的小海豚.Adult tucuxi dolphins have been seen trying to kill a newborn calf of their own species...
Huge cranes are swinging cargo up.巨大的起重机正在吊运货物.The stuffy "50s gave way to the swinging "60s.古板乏味的50年代被多姿多彩的60年代所取代。The bars are two round wooden bars used for such as swinging, vaulting, and handstands.双杠是两根圆形木制横杠,可做回环 ...