In complicated fishing operation, the tubing is very likely to deform, burst and tear owing to eccentric wear, thereby a kind of fishing spear with sliding cone blocks is developed.

针对复杂打捞中偏磨油管打捞时易变形、胀破或撕裂的难题，研制出特殊滑牙块打捞矛，打捞矛由上接头、矛杆、滑牙块、锁块、销钉、外筒等组成。

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But along with gladiator skills and spear fishing, falconry is one of the many throwback sports enjoying a revival as been-there-done-that travelers hunt for new experiences.

WSJ: Learn Ancient Sports Around the World

Dive shops in Florida and the Caribbean are asking clients to record where they find these ravenous consumers of native fish, and are encouraging divers to go spear fishing for them.

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All have been canceled, but he went spear fishing eight miles off the coast of Pensacola last week and caught a 28-pound red snapper some 80 feet below the surface.

WSJ: Gulf's Fishing-for-Fun Culture Also Takes Hit