The reason is that, besides its well-known role in haemoglobin, the oxygen-transporting molecule in the blood, iron is also involved in many aspects of brain development.
原因在于，除了铁在血红蛋白（血液中运输氧气的颗粒）中的重要性，大脑发育的很多方面都需要铁。
Some well-known travel agencies have obtained an enormous achievement in the aspects of network travel.
一些的知名的旅行社已经在网上旅游方面取得了巨大的成就（略）。
Some well-known travel agencies have obtained an enormous achievement in the aspects of network travel.
一些的知名的旅行社已经在网上旅游方面取得了巨大的成就（略）。
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