社会的发展和时代的变迁,人们生活中的投掷内容正在不断变化。在高度机械化和自动化面前,传统的、蛮拙的用力方式和单纯的体力劳动行为已经越来越远离现实生活,取而代之的是轻巧的、细致的、准确的运动行为:码头上高度自动化的传输装置将逐渐替代繁重的人力装卸;炼钢厂里高温炉 With the development of society and the changes of the times, the content of throwing in people’s lives is constantly changing. In the face of heightened mechanization and automation, the traditional, sloppy methods of exerting force and simple manual labor practices have become more and more remote from real life, replaced by lightweight, meticulous, and accurate athletic behavior: highly automated conveyors at docks Will gradually replace heavy human handling; high-temperature furnaces in steel mills