We should make it clear whether the damage was caused in transit or during the unloading process, or by other reasons.
我们要弄清楚货物是否在运输途中受损,还是在卸货过程中受损,或者别的原因。
This would solve the problem of ventilation, for if a train entered this tunnel, it would draw in fresh air behind it.
因为如果有列火车开进隧道,它就把新鲜空气随之抽进了隧道。