(四)       Have you ever seen plants growing from the roof of a car?       No? Then you probably haven't been to Thailand during the coronavirus pandemic. People inBangkok, Thailand's capital city, have started farming vegetables on car roofs, on top of taxis. They dothis by stretching black trash bags over the roofs. And then they fill them with soil. And then, as youwould usually do to make plants grow, they sprinkle the soil with seeds and water.       But why are they doing it on top of taxis? Well, places have formed in Bangkok, called "taxigraveyards. " The taxis have been parked there for a long time. They aren't being used becausetourists aren't going to Thailand due to the pandemic. A lot of taxi drivers are finding it difficult tosurvive because they have lost their source of income. So they have decided to grow vegetables toeat. And since they don't have land to do it in the city, they are doing it on top of the cars. The driverssay the black trash bags stop the soil from damaging the cars. People are growing lots of vegetables,such as spring onions, basil, chilies and even eggplants.       A lot of taxi drivers even had to leave Bangkok and return to their villages in the countryside.Hopefully, the pandemic will be over soon, and the taxi drivers can get back to earn money.(The reading is from News Lunchbox 2021-09-24)
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11. What does the word “taxi graveyards” in line 6 mean?
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