London Mayor Boris Johnson says he is joining a campaign to encourage Britain to leave the European union.

伦敦市长鲍里斯·约翰逊表示，他将参加英国“脱欧”活动。

The European union relies on Russia for about 40 percent of its natural gas and about 20 percent of the oil it consumes.

欧盟约百分之四十的天然气和约百分之二十的石油消耗依赖俄罗斯。