When the negatively and positively charged streams meet, a complete channel connecting the cloud and the ground is formed.
当带负电和带正电的粒子流相遇时，就会形成一条连接云层和地面的完整通道。
2
Supersonic flights are allowed only over water-and are thus limited to connecting wealthy cities separated by an ocean-because sonic booms can damage things and annoy people on the ground.
Application platforms, often also referred to as computing platforms, are designed from the ground up for connecting two disjoint markets: users and application developers.