The key was to use a pulley system that would magnify the applied force.
关键是要使用滑轮系统，以扩大其作用力。
The pulley over which this rope ran was fastened underneath the lantern in a little iron box, the key to which was kept by the lamp-lighter, and the rope itself was protected by a metal case.
绕绳子的转盘关在灯下面的一只小铁盒里，钥匙由点灯工人保管，绳子在一定的高度内有一根金属管子保护着。
Pulley is the key to open and close the Ji'nan guardrail is not smooth, the use of rolling bearing nylon wheel.
滑轮是济南护栏启闭是不是顺利的关键所在，应运用滚动轴承尼龙轮。
应用推荐