其二，这个球有弹性，所以在我放开的瞬间，可能会震动。
Number two, this thing is very springy, so the moment that I let it go, it probably goes in some kind of oscillation.
镍钢也是有弹性的，就是说它能经受震动、冲击和磨损。
Nickel steel is also elastic, that is, it can stand vibration, shocks and wear.
镍钢也是有弹性的，就是说它能经受震动、击和磨损。
Nickel steel is also elastic, that is, it can stand vibration, shocks and wear.
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