单词	observation ballon
释义	observation ballon 观测气球
随便看	the border of a cloth the border of a field the border of cardiac dullnes the border of Hunan-Hubei-Congqing-Guizhou the border problem the boot The boot black brought the black boot back The bootblack shines your boots the boot is on the other foot The boot is on the other foot the boot is on the other leg The boot is on the other leg the border regions the Border Regions of Guangxi The border survey the border tourism The Border Town the border-upon domain the border wall The border will be policed by UN officials The boreal forest is transcontinental the bored injection piles the borehole case-in-place pile the boots the boots of the apostle