bathysphere

n large, strongly built, hollow sphere that can be lowered deep into the sea (usu for observing marine life) 探海球, 潜水球（为一坚固的大型球形结构, 可潜入深海中, 通常用於观察海洋生物）.

bastion, bat, batch, batch processing, bated, bath, bath chair, bath mat, bath-tub, bathe, bathed, bather, bathetic, bathing, bathing suit, bathing-cap, bathing-costume (also bathing-suit), bathos, bathrobe (also robe), bathroom, batik, batiste, batman, baton, bats, batsman, battalion, batten, batter, battered, batteries, battering ram, battering-ram, battery, battery farm, battle, battle-cruiser, battle-cry, battleaxe, battledress,