这句话中hit的具体意思

这句话中hit的具体意思
If an earthquake hits when they're in a classroom, children learn to get under their desks ,head first,and to hold on to the legs of the desk until the quake is over.请把这句话翻译一下,并说出本句中“hit”的具体意思, 不要笼统地翻译成“发生”哦~

hit （风暴、疾病等）袭击【相当于strike】
假如地震时,他们在一个教室里,孩子们学习到桌子底下,头先进去,并抓住桌子的腿,直到地震结束.