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.
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.
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.
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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