题目内容
Where temporary repairs are effected to a ship at a port of loading，call or refuge，for the
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森林的生态效益是多方面的，远远大于它的经济效益。保护森林生态系统，是保证人类有美好生态环境的有效措施。()
森林生态系统具有最高的生物总量和最高的单位面积生物量，约占陆地生物总量的50%。()
There is a ______ when one or more vessels are towing or pushing another vessel or vessels，provided that they are all involved in commercial activities and not in a salvage operation．
There is a ______ act when，and only when，any extraordinary sacrifice or expenditure is intentionally and reasonably made or incurred for the common safety for the purpose of preserving from peril the property involved in a common maritime adventure．
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