This is BBC news, the latest headlines.

这里是BBC新闻头条。

Huge crowds have gathered in front of Buckingham Palace for a spectacular open air concert, marking a high point of the celebrations for Queen Elizabeth's 70 years on the British throne.

大批人群聚集在白金汉宫前，观看一场壮观的露天音乐会，标志着伊丽莎白女王在位70周年的庆祝活动达到了高潮。

In a tribute to his mother, Prince Charles praised what he called a lifetime of selfless service.

在对母亲的颂词中，查尔斯王子赞扬了他所说的毕生无私的服务。

Russia says Ukrainian troops in the eastern city of Severodonetsk have suffered critical losses and are retreating.

俄罗斯称，乌克兰军队在东部城市北顿涅茨克损失严重，正在撤退。

Ukraine insists it's still pushing back Russian forces despite the city remaining the main goal of Russia's offensive.

乌克兰坚称其仍在击退俄罗斯军队，尽管该城市仍然是俄罗斯进攻的主要目标。

Soldiers from both sides are locked in fierce street battles.

双方的士兵陷入了激烈的巷战。

And Mercedes-Benz has recalled nearly 1 million older vehicles worldwide due to a problem with the braking system.

由于刹车系统存在问题，梅赛德斯-奔驰已经在全球召回了近100万辆旧款汽车。

The German manufacturer says corrosion in some cars built between 2004 and 2015 could lead to the connection between the brake pedal and the braking system failing.

这家德国制造商表示，2004年至2015年生产的一些汽车存在腐蚀问题，可能会导致刹车踏板和刹车系统之间的连接失败。