然而，应该指出的是，一头驴的费用为2万坦桑尼亚先令，比一辆自行车还便宜，但它仍然是一项投资，相当于一个普通家庭半年以上的收入。

It should be noted, however, that a donkey, which at 20,000 Tanzanian shillings costs less than a bicycle, is still an investment equal to an average household's income over half a year.

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他认为：“大学仅收取家长支付给一个普通幼儿园一半的费用，大学应该有权利收取他们认为合适的学费。”

"Universities charge half of what parents pay for a place at an average nursery, "he said, "they should be allowed to set fees as they see fit."

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从20世纪70年代末开始，英国的普通家庭能够负担得起航空旅行的费用。

In the late 1970s, air travel became affordable for the average family in the UK.

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