公路平坦而笔直地向前延伸。The highway stretched out flat and straight ahead.海伦笔直地坐在椅子上。Helen sat upright in her chair.我喜欢她的头发笔直地垂下来.I like the way that her hair hangs down....

“笔直地”的英语可以翻译为：as the crow flies，straightforwards，uprightly ...