What is the world's first two-way icebreaker of "Snow Dragon II"?

Previously, a Russian scientific research ship was tightly trapped on the ice floes in Antarctica. China’s only polar expedition icebreaker, the "Xuelong", went to rescue, but was also trapped. But today's "Xuelong 2" can break ice not only at the bow, but also at the stern. I am "Uncle Encyclopedia" Rocket. Today we will take a closer look!
How does the icebreaker break the ice? What is the world's first two-way icebreaker of "Snow Dragon II"?
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