1·The sport's rules require that a race walker's knees stay straight through most of the leg swing and one foot remain in contact with the ground at all times.
这项运动的规则要求竞走运动员的膝盖在大部分的腿部摆动过程中保持笔直，一只脚始终与地面保持接触。
2·Simple: The rules require it to.
答案很简单：规则需要。
3·The rules require us all to be present.
按规定我们都要出席。
4·New rules require egg layers to have more capacious cages.
新法规要求为下蛋鸡安排更宽敞的鸡舍。
5·These business rules require server-side processing (that is, database lookups).
这些业务规则都要求进行服务器端处理(即数据库查找)。
6·Safety rules require passengers to stand behind yellow line while coach is moving.
安全规定在车辆运行时乘客须站于黄线之后。
7·The new rules require employers to provide about one liter of drinking water per worker per hour.
新的制度要求雇佣者为每个员工每小时提供一升的饮用水。
8·Mining association rules require two pieces of data, the transaction and what was bought in that transaction.
挖掘关联规则需要两方面的数据，事务及该事务中所包含的信息。
9·Federal safety rules require toys that use the batteries to have battery compartments that are locked with screws.
联邦安全规则要求，玩具使用的电池要有电池仓，并且要用螺丝将其锁定。
10·Federal Aviation Administration rules require airports to study the risks of wildlife to safe airport operations.
联邦航空局的规定要求各机场研究野生生物的撞击的危险以使机场能够安全的运行。