The swallow mouth, mud - although it bit by bit, not a building, but it can base on the nest of happiness.
燕子嘴上的春泥，别看它点点滴滴，筑不成大厦，却能垒起幸福之巢。
The swallow couple keep working on their nest with mud, straws and sticks.
小燕子夫妇继续用泥土，乾草和枯枝作窝。
The swallow couple keep working on their nest with mud, straws and sticks.
小燕子夫妇继续用泥土，乾草和枯枝作窝。
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