A group of scientists are going through the Amazon Rainforest.
穿过森林应该用 through 不能用 across
across是平面上的穿过
We walked across the bridge.我们从桥上走过.
through是空间上的穿过
We couldn't see through the mist.在雾中我们看不见东西
（雾是一个空间的范围）