strength各种词性变化：strong，strongly。
例句
1.
They had to check the strength of the seat attachments to the floor of the plane.
他们需要检查座椅与飞机舱面固定接头的强度。
2.
Certain materials can be manufactured with a high tensile strength.
有些材料可以制造成抗拉强度大的产品。
3.
Its oscillation depends on the strength of the gravitational field
它的振动幅度取决于引力场的强度。
动词：strengthen
形容词：strong
复数： strengths
strength
n.体力;力气;力量;强度;毅力;坚强决心;意志力量
The sea wall was not proof against the strength of the waves.
防波堤挡不住海浪的'力量。
sat down for a moment to gather my strength.
我坐下片刻积蓄力量。
Her decision to continue shows great strength of will.
她决心坚持下去，显示出了很大的意志力。