hollow w block 空心块
hollow w block floor 空心块楼板
Jeans-block hitop W 牛仔拼布鞋
hollow w clay block 空心陶土块
hollow w glass block 空心玻璃块
It takes an emergency vehicle an average of 15 seconds to go one block in the N-S direction and 20 seconds in the E-W direction.
应急车辆驶过一条南北向的街道平均要花15秒，而通过一条东西向的街道平均要花20秒。
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