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。
“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。
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