In contrast to the simple observations of the tides, tidal current studies are difficult and expensive.

与潮汐的简单观测不大相同，潮流研究的难度既大、费用也巨。

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In contrast to the simple observations of the tides, tidal current studies are difficult and expensive.

与潮汐的简单观测不大相同，潮流研究的难度既大、费用也巨。

youdao