In some cases, loading and unloading operations were simply too difficult.
在某些情况下，装货和卸货作业，只是太困难。
Time of the accident, a tanker unloading operations under way, after the fire safety of oil tankers have left.
事故发生时，一艘油轮正在进行卸油作业，起火后油轮已经安全离开。
Thirdly, we study the problem that quay cranes perform loading and unloading operations simultaneously in the same ship-bay, namely quay crane dual cycling scheduling problem.
然后，研究装卸桥在同一贝位内同时进行装船与卸船作业的调度问题，即同贝同步装卸调度问题。
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