pre-tension
/priːˈtenʃən/verb
with obj.
1- apply tension to (an object) before some other process or event预张; 预拉：
the safety system pre-tensions the seat belts.
安全系统会把安全带预先拉紧。
1.1
- strengthen (reinforced concrete) by applying tension to the reinforcing rods before the concrete has set（对钢筋混凝土）预张, 预拉伸。