冰天雪地的北极,厚厚的冰层上面有一些冰窟窿——海豹的出气口。体形硕大、浑身雪白的北极熊晃动着略显笨拙的身躯,在这些出气口间徘徊,期待着能够猎取到定时上来呼吸的海豹。北极熊这种主动性的进攻显然是不明智之举,海豹通过北极熊行走时冰层的震动,能够觉察北极熊的一举一动,并选择适当的出气口。北极熊的来回奔波,往往是徒劳无功的。北极熊意识到这种行动的愚蠢,它停止了可能会暴露行踪的走动,坚定地守着一个出气口,一动 The arctic ice and snow, thick ice layer above some ice caves - seal outlet. The huge, white polar bears wobbled a bit of awkward body and squatted between these outlets, hoping to hunt seals that were breathing regularly. The aggressive offensive of the polar bear is clearly an unwise move. Seals can detect the polar bears’ movements and select the appropriate air outlets through the vibration of the polar ice when the polar bear walks. The polar bears are often futile. Polar bears are aware of the stupidity of such actions. They stop their movements that may reveal their whereabouts, and they firmly guard an air outlet.