洞口外面，漆黑的夜晚宛如一块幕布。
Outside the cave mouth the blackness of night was like a curtain.
两条小船翁翁地驶出洞口，到了开阔的水面上。
Both boats purred out of the cave mouth and into open water.
接下来，用塑料板盖住洞口，并用泥土固定塑料板边缘。
Next, cover the hole with the plastic sheet, and secure the edges of the plastic with dirt.
当洞口的门被打开时，昏暗的暮色中出现了一幅令人悲伤的景象。
When the cave door was unlocked, a sorrowful sight presented itself in the dim twilight of the place.
南瓜放在桌子上，洞口在最上面，我弯下腰，把头压在洞口。
With the pumpkin resting on the table, hole uppermost, I bent over and pressed my head against the opening.
他仓促地开始准备洞口和搅拌混凝土。
He hurriedly prepares the hole and begins mixing the concrete.
它并没有完全填满洞口，他一直在往外看。
It did not entirely fill the aperture, and he had been looking over it.
这个洞口通向一个山洞，所以他们决定去看看。
This opening led to a cave, so they decided to have a look around it.
接下来，用塑料薄膜封住洞口，并用泥土固定住塑料膜边缘。
Next, you can cover the hole with the plastic sheet, securing the edges of the plastic with dirt.
鉴于穴居人一般都居住在洞口附近，因此，拉斯科岩洞许多代穴居者隐藏他们的艺术作品，其中必定存在某些原因。
Since cave dwellers normally lived close to entrances, there must have been some reason why so many generations of Lascaux cave dwellers hid their art.
鉴于穴居人一般都居住在洞口附近，因此，拉斯科岩洞许多代穴居者隐藏他们的艺术作品，其中必定存在某些原因。
Since cave dwellers normally lived close to entrances, there must have been some reason why so many generations of Lascaux cave dwellers hid their art.
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