31. Although apparently rigid, bones exhibit a degree of elasticity that enables the skeleton to withstand considerable impact.
骨头看起来是脆硬的,但它也有一定的弹性,使得骨骼能够承受相当的打击。
32. That xenon could not FORM chemical compounds was once believed by scientists.
科学家曾相信:氙气是不能形成化合物的。
33. Research into the dynamics of storms is directed toward improving the ability to predict these events and thus to minimize damage and avoid loss of life.