[体]拐弯球;
The screwball is the most difficult breaking ball to pitch, as it goes against the natural arm motion of the pitch.
螺旋球是最难投的变化球,因为它与胳膊在投球时的自然运动相反。
The natural shale was made into good performance ceramsite filter by ball making, and breaking processes.
以天然页岩为原料,分别采用破碎法和成球法制成滤料生料,经焙烧, 膨胀,制备了陶粒滤料.
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