Duöxiè. Thanks a lot.

Example 1:
A: Qîng bâ nàge bëizi dì gêi wô.
B: Gêi nî.
A: Duöxiè.

A: Please pass me the cup.
B: Here you are.
A: Thanks a lot.

Example 2:
A: Qîngwèn qù dòngwùyuán zênme zôu?
B: Cóng zhèli zuò èrshí’èr lù göngjiäochë kêyî zhíjië dào.
A: Duöxiè.

A: Would you tell me how to get to the zoo, please.
B: Take bus No. 22 from here. It will take you right there.
A: Thanks a lot.

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the word Duöxiè is a commonly used expression to say thanks. You may use it to express gratitude whenever someone helps you.

Synonymous Expressions
Xièxie.
Fëicháng gânxiè.