【答案解析】The lecture illustrates two techniques seabirds have developed to adapt to living in the sea. Albatrosses are famous for their energy-saving techniques: gliding and soaring. With long and slender wings, albatrosses can coast on the wind to lose altitude and borrow the air currents to soar up into the sky. This technique can help albatrosses fly over hundreds of miles of ocean surface without flapping. Another advantage seabirds have is an acute sense of smell. For example, petrels can find their burrows through recognizing their partner's odor at night, and this helps them effectively avoid predators. [听力原文] W: Seabirds have made numerous adaptations to living on and feeding in the sea. Because flight requires so much energy, seabirds have evolved various energy-saving techniques. Gliding and soaring are two energy-saving techniques. Gliding is "coasting" on the wind in a straight line or gentle curve while gradually losing altitude. Soaring is using air currents to gain altitude. The long, slender wings of albatrosses are ideal for gliding. Using a combination of gliding and soaring, an albatross can fly over hundreds of kilometers of ocean surface in search of food without flapping. Most seabirds have a well-developed sense of smell to adapt to living in the sea. The petrel is a good case in point. During the breeding period, many species of petrel live in groups on small oceanic islands. They form in pairs and live in burrows. Returning from the ocean at night, petrels must find their nest burrow by recognizing their partner's odor, suggesting the existence of an individual odor signature.