The second category of marine energy that I'll mention is tidal energy.

我要提到的第二种海洋能源是潮汐能源。

That's the real advantage of tidal energy, it's very, very predictable.

这是潮汐能优势的真正所在，即可预测性强。

Scotland is estimated to have a quarter of all the tidal energy resources in Europe.

据估测，苏格兰1/4的潮汐能来自欧洲。

The cost of producing tidal energy is more than two and half times the more established technology of offshore wind.

产生潮汐能的成本是离岸风成本的2.5倍多。而且离岸风的技术更为成熟。

Right now, the high cost of building, operating and maintaining tidal power technology means that tidal energy comes at a premium.

目前，建造、运行和维护潮汐能技术的高昂成本意味着潮汐能的价格很高。

There are other forms of tidal energy, but I'll go on to the third category of marine energy: ocean thermal energy conversion.

有很多其他形式的潮汐能，但是我会继续介绍第三种海洋能源：海洋热转换能源。

These could also be applied to tidal energy, as well.

这些也可以应用于潮汐能。

The idea is that if we can harness that tidal energy, it'd be a great, clean, renewable energy source.

想法是如果我们能利用潮汐能，它会成为一种很棒的可再生清洁能源。

Moreover, tidal areas are rich ecological zones, teeming with life, and tidal energy also offers a promising source of renewable power.

此外，潮汐区是丰富的生态区，充满生机，潮汐能也是一种很有前景的可再生能源。

For tidal energy to be effective, the difference between high and low tides needs to be at least five metres, and this occurs naturally in only about forty places on Earth.

要让潮汐能有效，高潮和低潮的差值需要至少是五米，而这只会在全球大概四十个地方自然发生。