frictional connection造句

例句与造句

1. The ground is the reaction mass and the frictional connection to the ground is a necessary component to its operation . " NASA regularly receives proposals of similar devices, and the memo recommended that future reviews of said proposals " should require that submitters meet minimal thresholds of proof before engaging in further correspondence ."
2. It's difficult to find frictional connection in a sentence. 用frictional connection造句挺难的