延伸变化 ：如果O4无法传球给O5或空位的投手，则O4将球回传给O1执行“掩护套掩护（Pick The Picker）”变化：O2利用O5的底线掩护（Base Screen）摆脱防守，然后O4再为O5做一个下掩护（Down Screen）。
基于8个网页-相关网页
Voice-activated picking directs the picker to the location, tells the number of each item to pick, and verifies the pick by reading the location number and repeating the count.
声控分拣系统引导操作员到货物的存放位置，告知需要拣取的货物型号，并通过读取位置码和复核货物数量，以核实分拣作业的正确性。
The picker is simple in structure and can automatically pick up the tennis on the ground, thus greatly improving the interest of playing tennis.
本 发明结构简单，可自动对设置在地上的网球进行拾取，大大提高了打球的乐趣。
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