常見例句雙語例句So Newton's Second Law tells me -Ff that mg sine alpha minus F f maximum =0 at this point is zero.根據(jù)牛頓第二定律,此時(shí)有mgsinα,最大。And minus Ff, the frictional force, which is the component uphill, and this is my equation number two.減去Ff，摩擦力，也就是滑坡曏上的力，這是第二個(gè)等式。 返回 minus ff