This is definitely a once-in-a-lifetime opportunity.
这绝对是个一生一次的机会。
Orcas rarely breach, so a perfect shot like this one is virtually a once-in-a-lifetime opportunity.
逆戟鲸几乎不跃出水面，所以这样一个完美的镜头抓住了那一个千载难逢的机会。
Orcas rarely breach, so a perfect shot like this one is virtually a once-in-a-lifetime opportunity.
逆戟鲸几乎不跃出水面，所以这样一个完美的镜头抓住了那一个千载难逢的机会。
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