He usually declares his team's innings at a predetermined time on the fourth day so that they can bowl at least 20 overs on that day and 90 overs on the last day.
他往往在第四天某个预先确定的时间宣布结束本队击球轮，从而他们队可以在当天投球至少20轮并且在最后一天投90轮。