The Nine Peaks in Songjiang are the only natural hills in Shanghai. Green trees amid the hills and red-roofed houses set off one another, with dense forests covering in the surface of the hills.

松江九峰是上海唯一一处自然山丘，山间绿树红楼掩映，山体表面林木深秀。

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There are two choices. Basically, whenever you want to set up a flux integral you have to choose one side of the surface.

有两种选择，当你要建立通量的积分时,就必须取定曲面的正向。

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One set of MRI images focused on grey matter at the brain's wrinkled surface, or cortex, where the processing of memory, emotions, speech, sight, hearing and motor control occurs.

一组磁共振成像主要关注大脑褶皱层或者脑皮层上的灰质组织，这些组织是用来处理记忆、情绪、演讲、视觉、听力和电动机操作的地方。

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When the larva grows to around 300 microns (roughly one-third of a millimetre), it extends its foot and seeks a suitable surface on which to set.

ECONOMIST: A dozen ocean-cleaners and a pint of Guinness, please