singleout挑选出来singleadj.单一的；单个的；特指某人或某物；单身的；单人的；单程的n.单程票；单曲；单人房间；单身者；<美>一元纸币；(网球)单打比赛；(板球)一分打；(棒球)一垒打v.挑选(一个)single budding一次芽接树single-shaft单杆的single freedom单自由度single machine间苗机,单机single spinner单圆盘撒布机single harness光棍生活single species单一种single riveted单行铆接single-slope单斜率single-cross单交, 简单杂交

1. The sections of pipelines that are over rivers always form multispan beam structure because of scouring, suspending and reimforcing.
   输油管线穿河段由于冲刷悬空，打桩加固形成多跨梁式结构。