例句
"Either there's a special machine that spits out silver iodide, dry ice or cement into the clouds, or a hatch opens and a guy with a shovel seeds the clouds manually, " he explains.
“其一是通过一种特殊的机器，将碘化银、干冰或凝结剂送入云霄，或者当飞机升空之后打开舱门，用铲子将药品洒出去，”他解释说。 “当云层接触到这些化学品，马上会形成一个大洞。