Tethered aerostat doesn't have dynamic devices, and it suspends on the upper space by buoyancy and cable 'pull.
系留气球不具有动力装置，靠浮力和缆绳的拉力作用悬浮于高空中。
Buoyancy compensators provide buoyancy control for scuba divers by allowing them to inflate or deflate the devices.
浮力补给装置可以让给潜水者以充气或放气控制。
Buoyancy compensators provide buoyancy control for scuba divers by allowing them to inflate or deflate the devices.
浮力补给装置可以让给潜水者以充气或放气控制。
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