They found fossils of microscopic marine plants which suggest that the region was once open ocean, not solid ice.
他们发现了微型海洋植物的化石，表明该地区曾经是开放的海洋，而不是坚固的冰层。
Within samples collected from the solid substances lying beneath the ice they found fossils of microscopic marine plants which suggest that the region was once open ocean not solid ice.
在从冰下的固体物质中收集的样本中，他们发现微型海洋植物的化石，这表明这个区域曾经是开阔的海洋而不是坚硬的冰。
Inner-lock safety door, once open, machine stopped immediately to ensure operator safety.
内锁式安全门设计，开门即停止，确保安全。
Once open, the highway is expected to see 400 trucks a day carrying goods from Brazil to Peruvian ports.
开通后，这条公路上预计每天会有400辆运货卡车从巴西开往秘鲁的港口。
Once open, remove the black foam stuck onto the back of the outside-facing vents and put everything back together.
打开以后，把通风孔后面的黑色泡沫阻挡物移除，重新把所有东西组装回去。
Once open, remove the black foam stuck onto the back of the outside-facing vents and put everything back together.
打开以后，把通风孔后面的黑色泡沫阻挡物移除，重新把所有东西组装回去。
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