---Thank you very much for your masks!

(traditional) 非常感謝 你送的 口罩！

(simplified)  非常感谢 你送的 口罩！

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thank you very much   非常感謝//非常感谢

grateful    感激

send sth to sb (as a gift) 送

mask  口罩

facial mask(help hydrate facial skin, a beauty product) 面膜