Answers

2015-08-10T21:01:29+08:00
Because the sound is bouncing back so even if it's crowded you can hear a strong sound
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are you sure about this?
yes, sound energy is bouncing back at night .. i can,t explain it well but, at night the frequency is high than morning ,, and the higher the frequency the more it will call an attention
2015-08-11T17:39:21+08:00
Because they strong sound and beautiful light 
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