Your brother left his bag of film on the ferryboat.
你哥哥将他的旅行袋遗放在渡船上了。
Do as the Romans do(or Do as they do at Rome).
入乡要随俗。
The men of our family waded down through our flooded meadows with boathooks, in the hope of being able to grapple a corner of the raft and pull it out of the current towards our bank.