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1.Scientists used cameras that take photos in the forest when an animal passes by.
pass by 经过；走过；(时间)逝去；过去；忽略；遗漏；不注意；
I passed by your house last night at about ten o'clcok.
我昨天晚上大约十点钟的时候经过你家。
Three years had passed by before she finally found a suitable job.
三年过去了，最终她才找到一份合适的工作。
2.Like other dogs, bush dogs hunt in packs of up to 10. They are known to communicate to each other using "high-pitched whines." They eat mostly large forest rodents.
in packs 成群
Lions do not hunt in packs, but alone.
狮子不成群猎食而是单独出动。
Wolves hunt in packs.
狼是成群猎食的。
