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This is BBC world news, the headlines.
这里是BBC世界新闻头条。
Gymnastics superstar Simone Biles has withdrawn from another Olympic event.
体操巨星西蒙·拜尔斯(Simone Biles)退出了另一项奥运会项目。
The individual all-round gymnastics competition say she needs to focus on her mental health.
体操个人全能比赛表示，她需要关注自己的心理健康。
It's a day after she pulled out of the team event.
前一天，她退出了团体赛。
There's been more success for Australia on day five of the 2020 Olympic Games in Tokyo.
在2020年东京奥运会的第五天，澳大利亚取得了更多成就。
At the aquatic center, Ariane Tipmus of Australia has won her second gold medal in the women's 200-metres swimming freestyle.
在水上运动中心，澳大利亚选手阿里安·蒂默斯在女子200米自由泳比赛中赢得了她的第二枚金牌。
Sydney's lockdown has been extended by another month as COVID cases continue to rise.
悉尼的新冠肺炎病例继续增加，封锁措施又延长了一个月。
Australia's largest city has been under stay-at-home orders since late June due to an outbreak of the Delta variant.
德尔塔变异毒株引发疫情，这座澳大利亚最大的城市自6月底以来一直在实行居家令。
U.S health officials have changed their advice on wearing masks.
美国卫生官员改变了佩戴口罩的建议。
Vaccinated people are now being advised to wear them indoors in places where infections are high.
在感染率较高的地区，接种疫苗的人员在室内也要佩戴口罩。
