Read the following paragraph and find TWO irrelevant sentences. 　The Arctic is shaping up to be one of the most strategically important regions in the 21st century. However, while Russia has been steadily building its Arctic capabilities, the U.S. nearly lost its only heavy polar icebreaker on an Antarctica deployment. Russia plans on adding two icebreaking patrol ships armed with cruise missiles by 20Thankfully, the U.S. government is beginning to take this gap seriously and there are actions the government can take to accelerate this revitalization (振兴).First, the Coast Guard should consider purchasing foreign- built icebreakers. Also, Congress can work with the Coast Guard to facilitate more efficient business practices. Foreign-built icebreakers could be significantly less expensive. Finally, the government should increase the Coast Guard's total acquisition budget. If Congress and the executive branch do not act quickly to reverse the current trends, then the U.S. is partially losing the opportunity to be a key player in this strategic region.