They still rely on batteries for propulsion, but are extremely stingy in their power demands because most of the time they "glide" through the water.
它们也是依靠电池推进，但是对电力的需求非常之小因为它们大多数时间是在水中“滑行”。
They still rely on batteries for propulsion, but are extremely stingy in their power demands because most of the time they "glide" through the water.
它们也是依靠电池推进，但是对电力的需求非常之小因为它们大多数时间是在水中“滑行”。
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