After the deer drank up, Billy jumped up and ran back to the house to get more water.

小鹿喝完后，比利跳起来，跑回屋里去拿更多的水。

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Deer: The water looks cool and fresh. Hmm... I was right. It tastes very good. I will drink a little more.

鹿：这水看起来清凉又干净。嗯……没错，真好喝。我要再喝一点。

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The deer clustered together near the water.

那些鹿集结在水边。

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The most recent newcomer is the Chinese water deer, which became established in the wild in the 1920s.

BBC: Deer: 50% cull 'necessary to protect countryside'

The others - muntjac, sika and Chinese water deer - were introduced in the past 150 years.

BBC: Roe deer numbers 'changing woodland ecosystems'

One thing's clear, however: The artist purposely chose to position each image above a protruding ridgeline that runs along the cave wall, symbolizing either the surface of the water or tall grass that's obscuring the lower half of the deer.

WSJ: Prehistoric but Far From Primitive | Cave Paintings of Lascaux | Field Museum | By Mark Yost