A trait is something about a person, such as a way they look or behave. Traits are often passed down through families. People might have behavioral traits such as being a hard worker that may be particular to them or others around them.
The children in the picture share the trait of red hair - red hair is a trait in their family.
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A person or animal is underweight if they weigh less than they should. When you are underweight you can easily see your bones.
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Update means to add new features or corrections to an existing product, such as a computer, phone, or website.
Something vibrates when it moves backwards and forwards very quickly. If something vibrates fast enough, it produces a musical note. Musical instruments work by making a part of them vibrate in some way. The picture is of a vibrating guitar string.
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Weight is a measure of how heavy something is. The more something weighs, the heavier it is.