航行一直很顺利，直到他们碰上了商船的尾流。The ride was smooth until they got into the merchant ship's wake.我一碰上悲伤的事物就难以控制情绪。I overreact to anything sad.很奇怪,我在这儿碰上他了.It is very extraordinary that I should meet him here....
地貌学研究地形的成因及其变化.Geomorphology deals with the origin of landscapes and changes in them.和地下的水道砂岩打交道的石油地质工作者,必须具备地貌学方面的基础知识.The petroleum exploration geologist working with subsurface channel sandstone must have a background...