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But the focus on Biden's age is somewhat ironic given that the 78-year-old Sanders is actually a year older than Biden.

But there are obstacles to widespread use of sustainable aviation fuel, said Pavlenko, the researcher with the International Council on Clean Transportation.

But there are opportunities around us, it's just a case of seeing them. This may involve doing something you haven't done before - or saying yes when you would have normally said no.

By 2025, SAIC plans to achieve the goal of selling 1 million vehicles overseas annually, including 100,000 own-brand vehicles in European market, Yu added.

But what is needed to facilitate economic recovery is concerted efforts from all sectors of the community to stop the violence and chaos and the withdrawal of the dirty hands from outside the SAR that have been stirring up the trouble.