The U.S. says it won't be intimidated by Russia's resurgence submarine fleet but it is rallying allies to get serious about countering Moscow's underwater moves.

美国表示，它不会被俄罗斯重新崛起的潜艇舰队吓倒，它此时正在召集盟国，认真对待并打击莫斯科的水下行动。

It started in the 16th century, and for hundreds of years players were keeping track of moves and counter moves and counter-counter-counter-counter moves.

它始于 16 世纪，数百年来，棋手们一直在跟踪走棋、反击棋、反反击棋。