running out of air down here would be fatal. 在这里 耗尽氧气将是致命的 To avoid getting lost 为了避免迷路 divers carry with them a spool of string. 潜水员必须随身携带一捆轴线 It becomes their lifeline - 这成了它们的救生索 literally. 绝对如此 The string also doubles as a measuring tap...
To avoid getting lost 为了避免迷路 divers carry with them a spool of string. 潜水员必须随身携带一捆轴线 It becomes their lifeline - 这成了它们的救生索 literally. 绝对如此 The string also doubles as a measuring tape - 这根线同时也是测量尺 a technique that has been used here, in Mexi...
divers carry with them a spool of string. 潜水员必须随身携带一捆轴线 It becomes their lifeline - 这成了它们的救生索 literally. 绝对如此 The string also doubles as a measuring tape - 这根线同时也是测量尺 a technique that has been used here, in Mexico, to chart the largest unde...
So far, more than 350 miles of underwater galleries in the Yucatan have been mapped, 人们迄今为止已绘制了350英里的 尤卡坦半岛地下水系图 but still nobody yet knows the true extend of this subterranean waterworld. 但仍旧无人知晓 这个地下水世界究竟有多大 And with good reason. 以及它形成的原因...
but still nobody yet knows the true extend of this subterranean waterworld. 但仍旧无人知晓 这个地下水世界究竟有多大 And with good reason. 以及它形成的原因 Underwater caving is notoriously dangerous. 地下水洞是出了名的危险 When the nearest exit may be hundreds of metres or more ...
And with good reason. 以及它形成的原因 Underwater caving is notoriously dangerous. 地下水洞是出了名的危险 When the nearest exit may be hundreds of metres or more away, 最近的出口可能远在 几百米之外或者更远的地方 running out of air down here would be fatal. 在这里 耗尽氧气将是致命的 To avoid ...
Underwater caving is notoriously dangerous. 地下水洞是出了名的危险 When the nearest exit may be hundreds of metres or more away, 最近的出口可能远在 几百米之外或者更远的地方 running out of air down here would be fatal. 在这里 耗尽氧气将是致命的 To avoid getting lost 为了避免迷路 divers carr...
the Yucatan's forest could not grow so luxuriantly. 尤卡坦半岛的森林不可能长得如此茂盛 The Maya knew that their lives depended on this water, 玛雅人固然知道 它们的生活离不开这些水 but it's only with the help of today's technology 但只有借助现代科技 that we've come to ...
The Maya knew that their lives depended on this water, 玛雅人固然知道 它们的生活离不开这些水 but it's only with the help of today's technology 但只有借助现代科技 that we've come to appreciate the full significance and scale of these flooded passageways. 我...
but it's only with the help of today's technology 但只有借助现代科技 that we've come to appreciate the full significance and scale of these flooded passageways. 我们才能完全了解 这些地下水道的重要性及其规模 So far, more than 350 miles of underwater galleries ...