Concentrated by the tropical sunshine, 在热带阳光的照射下
Although most life in tropical waters is concentrated around the coral reefs and the seagrass meadows, 虽然多数热带海洋生物 聚集在珊瑚礁或者海洋牧场里
The krill becomes concentrated as the spiralling net of bubbles draws inwards. 螺旋型的气泡网逐渐收紧,把磷虾聚在一起