ground rule

基本解释

Note: For a ball played from outside the teeing ground or from a wrong teeing ground ― see Rule 11-4.
注：从发球区以外打的球或从错误的发球区打的球，见规则11-4。
The negative relationship between activity density and soil water content might be a general rule of desert ground-dwelling beetle's distribution at local scales.
活动密度与土壤含水量的负相关关系可能是局域尺度下荒漠地表甲虫多样性的一般性规律；
www.biodiversity-science.net
We should build an open and rule-based multilateral trading regime through equal-footed dialogue in the spirit of seeking common ground while putting aside differences.
要通过平等协商、求同存异，建设开放的以规则为基础的多边贸易体制。

He was one for 4 with a ground-rule double and two strikeouts.
NPR: Trout Hits For Cycle, Drives In 5, Angels Rout M's
Connor Gillaspie hit a long fly ball that left fielder that Shane Victorino couldn't catch over his shoulder at the warning track, and it bounced over the wall for a run-scoring ground-rule double.
NPR: US Team Plays To 4-4 Tie With White Sox

The ground rules for something are the basic principles on which future action will be based.