What was the major decisions made at Yalta conference?

雅尔塔会议做的主要决定是什么？

On Yalta Conference, without Poland representative attending, The Russia, the America and the British initial established the eastern boundary of the Poland.

在雅尔塔会议上，在没有波兰代表参与的情况下，苏美英三大国初步商定了波兰东部的边界。