【PTE干货】PTE 高频summarize spoken test精析 （九：Wave power and devices）
Wave power and devices
Sea creatures are inspiring the latest devices that harness wave power. This one called the oyster sits on the ocean floor and opens and closes as waves pass over it. Cables attach it to generators on the shore. Since November 2009, it’s been powering 9,000 homes in the Orkney Islands. Another device looks like a snake. The anaconda is made from a rubber tube filled with water that floats just below the surface. When a swell hits the front of it, the tube is squeezed. A bulge ripples down its length and powers a turbine in its tail. Prototypes are currently being tested, but the full-scale version will be 200 meters long. This system also looks like a snake but this one is made of steel. If floats near the surface where waves make its joints move. This drives hydraulic systems that power electrical generators, like the anaconda, it’s still being tested. Results will prove if these devices are up to the job of supplying viable sources of green energy.
Sea creatures 海洋生物
Harness wave power 利用潮汐能
Pass over sth. 穿过／经过
ripple down 冲下去
hydraulic system 水利系统
up to the job 准备好
This lecture introduces three different devices that harness wave power.
The speaker firstly mentioned that to harness wave power, the devices built resemble certain sea creatures. For example, the first device looks like an oyster which opens and closes as the wave goes, and it provides electricity for the residents. The other two devices looks like anaconda and snakes which were made with steel tube. These devices are still tested to see if they are up for the job of providing green power.