"Video monitors" were part of MLB's strengthened policy this season to prohibit electronic sign stealing.
MLB 2019 这季用影像监视 防止电子偷暗号
Those who worked inside Minute Maid Park were instructed specifically to listen for banging sounds in the Astros dugout -
那些装在Minute Maid Park的监视器
被要求注意从太空人休息区传出来的Bang Bang声
https://twitter.com/Chandler_Rome/status/1196596920984252421?s=09