横木视网膜大脑组成包围拉长景象
摘要：For this experiment, you will need:● a rulerWhich is bigger?▲Look at the two small squares. Which is bigger – the yellow one or the blue one?Which is longer?▲This lorry is losing its load. Two beams(横木) have fallen onto the road. Which do you think is longer, No.1 or No.2?▲
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