If the runner runs one kilometer, the providers each give the runner $1 for the charity.
如果跑步者跑了一公里，供应商每人给跑步者1美元用于慈善。
2
If the bicyclist rides faster than the runner can go, and will be looping back to meet the runner, make sure the bicyclist knows how to signal properly and avoid turning into traffic.
如骑车者速度比跑步者快很多，将可能迂回后跟其汇合，确保骑车者知道如何向其示意，并避免发生意外。
3
One analogy for this relationship is that of a relay race, where the first runner represents requirements management and the next runner, receiving a baton hand off, represents test management.