Not so long ago, these whales faced a graver threat. 不久之前 这些鲸鱼面临着更严重的威胁
the sun's power can quickly turn from salvation to threat. 太阳的热力很快从救星变成了威胁
But the greatest threat they face is change. 但它们眼前的最大威胁已经改变
The threat diminishes, and vampyroteuthis disappears into the blackness. 威胁消失,吸血鬼鱿鱼也消失在黑暗中
The threat of winter frost is not the only reason for trees to shed leaves. 寒冬的威胁不是树木落叶的唯一原因
seemingly aware that the injured bear no longer poses a threat to them or their young. 似乎意识到受伤的熊 再也不会对自己和幼仔构成威胁
In the whiteout, the threat is almost impossible to detect, 在白茫茫的天气中 有危险也几乎不可能察觉到