研究人员发现，只有动作类游戏在改善游戏方面值得进一步研究。
The researcher's discovery that only action games improved vision is another avenue that deserves further investigation.
第二，因为只有雄鹿会做出摩擦动作，摩擦动作和与之相关的化学物质表明了制造擦痕的鹿的性别。
Second, because only male deer rub, the buck rub and its associated chemicals indicate the sex of the deer producing the rub.
并不是只有人类通过肢体动作来取悦异性。
Humans aren't the only animals that move in special ways to lure females.
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