a switchback + noun
We drove along a narrow switchback road.
我们沿着一条狭窄的Z形路行驶。
陡坡起伏铁路；利用惯性行驶的铁路；特技飞行的陡升陡降航线；陡坡上呈之字形铺设的铁路轨道,列车在每个转折处反向行驶。；一种陡峭升降的轨道,列车部分或完全靠重力,利用下坡动量上坡；尤指(英国旧称)游乐园中的游乐轨道,一种过山车。；由一系列陡峭升降组成的飞行路线,通常作为特技飞行。
a zigzag railway on a steep slope, with trains reversing direction at each bend
陡坡上呈之字形铺设的铁路轨道,列车在每个转折处反向行驶。
A railway track on a steep slope in a zigzag formation, in which a train travels in a reverse direction at each switch.
一种陡峭升降的轨道,列车部分或完全靠重力,利用下坡动量上坡；尤指(英国旧称)游乐园中的游乐轨道,一种过山车。
A railway track on which there are steep ascents and descents, a train moving partially or fully by the force of gravity using the momentum generated when descending to travel up an ascending part of the track; especially (UK, dated), such a track built for fun rides at an amusement park; a type of rollercoaster.
由一系列陡峭升降组成的飞行路线,通常作为特技飞行。
A flight path consisting of a series of steep ascents and descents, generally flown as a stunt.
The old mountain railway has a switchback that lets trains climb the steep slope.
这条古老的山区铁路有一段之字形线路，让火车能爬过陡坡。
用法提示：句中 switchback 是名词，指陡坡上之字形折返的铁路段。
The train slowed down as it entered the switchback, then reversed direction to continue upward.
火车进入之字形折返段时减速，然后反向继续向上行驶。
用法提示：switchback 作名词，表示铁路的折返式线路。
Hikers stopped to watch the freight train navigate the switchback above the valley.
徒步者们停下来观看货运列车穿过山谷上方那段之字形铁路。
用法提示：switchback 为名词，指陡坡上呈之字形折返的铁路。
We drove along a narrow switchback road.
我们沿着一条狭窄的Z形路行驶。
switchback作可数名词，常以复数形式出现。
The trail had a series of steep switchbacks.
这条小路上有一系列陡峭的Z形拐弯。
Hikers had to navigate several switchbacks to reach the summit.
徒步者必须经过几个Z形路段才能到达山顶。
grammar · medium
易错句子This road is very switchback.
正确表达This road has many switchbacks.
中文学习者容易将名词'Z形爬坡路线'误用作形容词'陡峭Z形的'。正确用法是作为可数名词，表示具体的Z形路段或路线。句中'has many switchbacks'才是自然表达。
grammar · medium
易错句子There are many switchback on this mountain road.
正确表达There are many switchbacks on this mountain road.
中文学习者容易忘记可数名词switchback的复数形式。在表示多个Z形路段时，需加-s变为switchbacks。
switchback指用于爬坡的Z字形连续弯道，hairpin指单个U形急转弯。
switchback特指山坡上交替转向的爬坡路，zigzag泛指任何之字形折线。
switchback是道路名词，switch是电器开关或动词，发音相近但意义完全不同。
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