英语句子

指甲是覆盖每个指尖、从甲根开始的一块坚硬甲片。The fingernail is a hard plate that covers the end of each finger, starting just above the cuticle.

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手腕是把手和手臂连在一起的关节。The wrist is the joint that connects your hand to your arm.

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虽然小指没有那么有力，但它对许多日常动作来说依然很重要。Even though the little finger is not very strong, it is important for many daily movements.

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无名指是手上的第四个手指，在中指和小指之间。The ring finger is the fourth finger on your hand, found between the middle finger and the little finger.

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许多神经分布在手掌，帮助你快速感知冷热和疼痛。Many nerves run through the palm, helping you sense hot, cold, and pain quickly.

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拇指与其他手指配合，可以写字、拉拉链、握杯子。The thumb works with the fingers for actions like writing, zippering, and holding a glass.

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食指内部的骨头既灵活又结实，让动作变得容易。The bones inside the index finger are flexible but strong, making it easy to move and grip.

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中指是从拇指开始数的第三个手指。The middle finger is the third finger on your hand, counting from the thumb.

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当你在明亮的地方时，瞳孔会变小；黑暗时，它会变大。When you are in a bright place, the pupil becomes smaller, but in the dark, it gets bigger.

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虹膜整天都在工作，帮助眼睛在强光和弱光下都能看清东西。The iris works all day to help your eyes see clearly in bright and dim light.

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睫毛自然会脱落，新睫毛会在原来的位置重新长出来。Eyelashes naturally fall out and new ones grow in their place.

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泪管是每只眼睛内侧角落里的细小通道。The tear duct is a small tube near the inside corner of each eye.

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每个人的下巴都是由下颌骨形成的，这决定了面部轮廓。Each chin is shaped by the jawbone, which gives the face its outline.

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大多数成年人有三十二颗牙齿，有助于咬断和咀嚼食物。Most adults have thirty-two teeth that help them bite and chew food.

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Inside the nostrils, there are tiny hairs that help trap dust and dirt from the air.鼻孔内部有细小的毛发，可以帮助阻挡空气中的灰尘和杂质。

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