When someone signs train gone, they are signing an American Sign Language Idiomatic expression. The idiom train gone is used when you missed what is being talked about. The sign is based on the sign for train. It could be formed using both hands, creating a L-shape, U-shape, and a G-shape.
Will that's funny the right answer is.A.
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A sensory detail is a detail that has something to do with the 5 senses (sight, smell, hearing, taste and touch) I didn't see any examples in the question that you posted but I hope this helps
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