又要进行一年一度的大扫除了。高层写字楼管理人员又该头疼了:室内的卫生还好说,可这大大的落地窗,还有那直上直下的外墙。唉,二十多层的高楼看着都头晕。没办法,只能请被称为“蜘蛛人”的高层建筑清洁工来清洗了。咦?为何对面那座高楼从未见被“蜘蛛人”清洗过,可外墙、玻璃始终光洁如新?其实,人家的清洁工一直就在外墙和玻璃上站着呢,只是你看不见罢了。清洁工是谁? It is also necessary to carry out the annual sweep. The high-rise office building managers also have headaches: The internal sanitation is better, but this is a large floor-to-ceiling window, as well as a straight up and down wall. Hey, twenty-story tall buildings looked dizzy. No way, only high-rise building cleaners called “Spiderman” can be cleaned. Why? The tall building across the street has never been cleaned by Spider-Man, but the outer walls and glass are always clean and fresh. In fact, people’s cleaners have been standing on the external walls and glass, but you can’t see it. Who is the cleaner?