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小学科学知识趣味学53：什么是简单机械（下）
为了给农场中新出生的小猪建造新家，汪汪队的几只狗狗一起合作，给三只小猪建造了新猪圈。它们开心地到新家中玩耍，爱玛和科尼也想到新到猪圈里玩，它们冲进猪圈，却不小心卡在了门口，狗狗们花了好大力气才把它们推出去！
小学科学知识趣味学53/81
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