The aim of this paper is to give a more or less general treatment of vibration of elastic non-uniform strut, such as composite woodenscrew-propeller.
本文以集合木制螺旋桨作为启示的出发点，从而想使弹性直杆振动问题能初步臻于一个比较更一般的处理。
2
In the beginning, the first attack subs consisted of a man hand-cranking away in a wood and leather suicide tube while attempting to attach explosives to a battleship using a woodenscrew.
最初，第一艘攻击型潜艇上装载有一个木制手动升降柄和皮革爆炸管，爆炸管用来把炸药用木钉固定在舰船上。
3
"The rollercoaster is wooden and so unlike rides made from iron and steel there was always a chance of the odd nail or screw that would not be entirely flat," he said.