ironworking

Research choices are often dependent on the specific civ, but you are going to want to get Iron Working and The Wheel sooner rather than later, just so you know where the iron and horses are.

研发的选择依赖于选择的特定种族，但需要尽快得到铁器(IronWorking)和轮子(Wheel)，只有知道，能看到战略资源铁和马在什么地方。