Two blind subjects used clicks and their echoes to distinguish objects like a car, tree or flag pole.
两名盲人受试者通过敲击和听其回声来辨别诸如汽车、树或棋杆等物件。
Do not raise the flag while it is folded. Unfold the flag first and then hoist it quickly to the top of the flag pole.
国旗还折着的时候不要把它升起来，首先要打开国旗，然后迅速的把它升到旗杆的顶部。
Do not raise the flag while it is folded. Unfold the flag first and then hoist it quickly to the top of the flag pole.
国旗还折着的时候不要把它升起来，首先要打开国旗，然后迅速的把它升到旗杆的顶部。
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