First, the pipes will be fed by new wide inlet heads, which slow the water so that fish are not sucked in. And to prevent fish swimming within two metres (6.5ft) of the intakes, the new acoustic system is being tested.
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Number (17): Everything in this space must add up to 17. The answer is 4-5, placed horizontally; 6-6, placed horizontally.
（作者为中国社会科学院学部委员、台湾史研究中心主任）