Tortillas are usually flat and round, but they can also be made into other shapes.
玉米饼通常是扁圆的，但也可以把它们做成其他形状。
Tiles can be fixed to any surface as long as it's flat, firm and dry.
瓷砖可以固定在任何表面上，只要这些表面是平整、坚固、干燥的。
One vehicle with a flat tyre can bring the motorway to a standstill.
一辆轮胎瘪掉的汽车就能导致公路交通的停顿。
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