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1·Show me the phot of the boy.

给我看看那个男孩的照片。

2·When saw those phot I could't help but remember the past good days before.

看到那些照片，我不禁想起美好的昔日时光。

3·Both rely on mathematical calculations to determine the location from which a positron or phot on was emitted.

这两种成像方法均依靠精确的计算来决定正电子或光于发射的位置。