主線；主靜脈

nbsp;  The train moved slowly south through flat, drab mainline scenery. 火車穿過干線兩側(cè)風(fēng)景單調(diào)乏味的地區(qū)，緩緩地向南駛?cè)ァ?!--www.www.sigorfond.com 中小學(xué)英語網(wǎng)-->

The train moved slowly south through flat, drab mainline scenery. 火車穿過干線兩側(cè)風(fēng)景單調(diào)乏味的地區(qū)，緩緩地向南駛?cè)ァ?/p>

n.main line 干線列車