That will come at a time when "yellow label cars" - those heavy-polluting vehicles - have been cleaned up off the road after a more-than-two-years effort.
2
大角星是西部天空最亮的星星，所以你不会错过这个黄橙色的指示标。
Arcturus is the brightest star in your western sky, so you can't miss this yellow-orange beacon.
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