We need to be careful with this, because it affects the entire travelling system.

我们必须小心处理这件事，因为这会影响整个旅行的系统。

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Main parts such as crownblock, mast, substructure, rotary table and travelling system of drilling rig meet API standard.

钻机天车、井架、底座、转盘及游动系统等主要配套件符合API规范。

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Thanks to the latest efforts to tackle the gridlock in Beijing, like the license-plate lottery system and increased parking fees, many people are now travelling by bike.

由于北京为解决交通阻塞做出的最新努力，如车牌摇号方式和提高停车费用，如今很多人都改骑自行车。

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This servicing plan should free up resources for Nasa to build an astronaut Space Launch System capable of travelling beyond the station, to the Moon, asteroids and to Mars.

BBC: Shuttle Endeavour launches one last time

There have been concerns that Russia's vast size, its remoteness from other countries and what is seen as a relatively weak transport system could make travelling around the country problematic.

BBC: Russia & Qatar will host the 2018 and 2022 World Cups

Attention was drawn to the system when a man travelling with his wife got an alert as they left Riyadh airport.

BBC: Saudi women in Riyadh. File photo