The cost of putting equipment under water and concerns about the impact on the Marine environment have kept tidal experimental, but that's beginning to change.
设备的水下安装成本和影响海洋环境的担忧耽搁了潮汐能试验，但是这种局面正在改变。
The worldwide travel of the ballast water causes concerns about its influence over the environment.
压载水被带至世界各处，这使人们不得不担心这一现象给海洋环境所带来了影响。
The worldwide travel of the ballast water causes concerns about its influence over the environment.
压载水被带至世界各处，这使人们不得不担心这一现象给海洋环境所带来了影响。
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