it's a lucky reprieve. 可以暂时喘一口气了

155. ..and they are lethally efficient.
     而且效率十分之高
156. But it appears that school is over for today.
     但似乎今天的课程到此为止了
157. For a few battle-scarred survivors,
     这些幸存下来的伤痕累累的蝠鲼
158. it's a lucky reprieve.
     可以暂时喘一口气了
159. With the orca gone, the rays can resume their courtship...
     虎鲸离开后 蝠鲼群得以继续它们的求偶行为
160. ..and they do so in astounding numbers.
     而且规模惊人
161. Tens of thousands of rays in a single shoal.
     数以万计的蝠鲼聚集在一起

来自《行星地球 第三季 第二集 Planet Earth S03E02 海洋》第 158 行