Chūntiān dào le, háizimen zài tiányě lǐ fàng zhǐyuān.
Spring has come, and the children are flying kites in the fields.
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纸鸢 is the old literary name for the kite; everyday Chinese says 风筝. 鸢 is a bird of prey, so the name means "paper hawk". Most people know it from the Qing poet Gao Ding's line 忙趁东风放纸鸢.