The boy jumped repeatedly, crisscrossing his arms to semaphore the danger.孩子不停地蹦跳，举起胳膊交叉摇晃，发出危险信号。They spent the next two years crisscrossing the country by bus.接下来的两年他们乘公共汽车在乡下多次往返。Scientists have been crisscrossing the country to collect data.科学家们为收集数据一直在全国各地奔走。