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(有連續急轉彎的)上山公路;(公路上的)急轉彎
A switchback is a road which goes up a steep hill in a series of sharp bends, or a sharp bend in a road.
例句
Several hundred yards beyond the first switchback in the road, he came to the second bend.
過了公路上第一個急轉彎幾百碼處，他又遇到了第二個急轉彎。