This program implements a standard version of Cuckoo Search (CS), as the Levy flights and generation of new solutions may use slightly different methods.

该方案实现了布谷鸟搜索(CS)的标准版本，作为征费的航班，并生成新的解决方案，可以使用稍微不同的方法。

youdao

And there will be a row, complete with legal battles, over the EU's plan to levy a carbon tax on flights to or from Europe.

同时可以预见，欧盟针对进出欧洲的航班征收碳排放税的计划将会引来一连串的司法拉锯。

youdao

This could mean the Welsh Assembly is given more powers to levy some taxes, such as rubbish dumping costs, air passenger duty on flights and stamp duty when buying homes, although it would not be limited to those taxes.

BBC: Silk commission debate part one