他们还指出如果他们在国内学习就不会存在语言和文化障碍。
They also point out that there are no language and cultural barriers if they study at home.
躲猫猫游戏风行世界各地，跨越语言和文化障碍，为何它如此普遍？也许因为它是一种强大的学习工具。
Peekaboo is a game played over the world, crossing language and cultural barriers. Why is it so universal? Perhaps because it's such a powerful learning tool.
铅是一种被证实了的神经毒素，它可以导致学习，语言和行为能力障碍。
Lead is a proven neurotoxin that can cause learning, language and behavioral problems.
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