open-air

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Thanks for your last letter several days ago.In your last letter,you told me your worries about the bad weather and terrible traffic , and you were hesitant about attending the open-air concert held in the century park next Friday.

美抗旱奇招：水库投遮阳球Los Angeles protects open-air reservoirs with millions of floating 'shade balls'The city has completed a program of covering open-air reservoirs with floating shade balls to protect water quality.