Notes:
rev up an engine エンジンをふかす；
cat-and-mouse game イタチゴッコ
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I heard the sound of a Japanese summer late last night. It got louder and louder as it came towards me. Someone was revving up the engine of their motorcycle as they were riding. Luckily, there was only one rider, so the noise came and went quickly. When there is a large gang, the noise goes on much longer. Motorcycle gangs in Japan like to drive through the streets slowly and make as much noise as possible. They often play a cat-and-mouse game with the police. (by Prof. Douglas Jarrell)