stop idling campaign

When my friend came to Japan, he asked me why Japanese buses stopped their engins during the traffic jams, especially in Kyoto. I told him because we kept trying to stop idling as a campaign. We have an important problem of environment and need to stop the global warming demage, so several bus companies have the campaign. He understood the reason and he sid, it was a good idea and we should think about the problem and what we could do.

a 5-yen coin

When my friend came to Japan, he asked me, which coin it was and show the 5-yen coin. I told him, it was 5-yen and asked him, why he couldn't recognise it. I didn't expect the reason, he told me there was no number. A-ha, I didn't know that, yes, it only had the number in Kanji. Perhaps, Chinese people could recognise it but it might have been hard for westerners. If you found the golden coin has a hole on the centre, it is definitely 5-yen coin in Japan.