People just drop by and knock on your door.

人们只会过来敲你的门。

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All of these have knock-on effects both on people and on the processes of the planet.

所有的这些都对地球的进程和人类产生了连锁的影响。

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Late one night there was a knock at the door. David peeked around his father at the young man and his wife, who was on a donkey. They had no room for these people! What could they do?

一天夜里，有人敲门，大卫偷偷看了一眼，原来来了一对骑着驴的夫妇，但是旅店已满，已经没有地方给他们夫妻俩住了，怎么办呢？

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And Employment Secretary David Blunkett said the government wanted to ensure there was "one door to knock on" for people of working age.

BBC: Work and welfare agencies to merge

"It's a source of marriage breakdown, of stress, of people being ill, being off work - the knock-on effect of people wrestling with unmanageable debt in their lives can be massive, " he says.

BBC: Valleys church helps community fight debt

Shelter Cymru director John Puzey said there was a knock-on effect on people on the lowest incomes, as people who would have bought "on the lowest rung" were now also competing for "scarce rental accommodation".

BBC: NEWS | UK | Wales | Affordable housing 'crisis' fear