He set a very big iron ball and a big hammer on the stage.
他在讲台上放置了一个很大很大的铁球和一把铁锤。
“Iron is a big concern because it affects brain development,” says Dr. Greene.
“因为铁影响脑部发育，所以大家特别关心它”，格林博士说。
"Iron is a big concern because it affects brain development," says Dr. Greene.
“因为铁影响脑部发育，所以大家特别关心它”，格林博士说。
Use diameter 500 super big mirror roller, iron effect much better.
采用直径500的超大镜面滚，熨光效果更为明显。
Answer: the ferrous oxide iron quality score than big.
答：氧化亚铁含铁质量分数比大。
Answer: the ferrous oxide iron quality score than big.
答：氧化亚铁含铁质量分数比大。
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