lengthening 

英汉解释

v. 延长（lengthen的ing形式）；使加长；放长

同义词

n. perpetuation，prolongation，protraction

参考例句

1. Open-air exercise undoubtedly have lengthened the old man's life.
户外运动无疑延长了老人的寿命。
2. The daylight is lengthening as summer approaches.
随着夏天的临近，白天在变长。
3. To what extent will future scientific discoveries make possible the lengthening of human life?
未来科学达到什么程度才能使延长人类生命成为可能?

英英解释

n.
  1. the act of prolonging something

网络释义

lengthening
加长; 船身加长法; 延长; 延长 拉长;
lengthening piece
活钩链段; 释义：延长接管(镭疗时用); 接长料; 接长杆件;
lengthening coefficient
伸长系数,延伸系数; 延伸系数，伸长系数; 伸长系数; 延伸系数;
lengthening fascia
释义：筋膜延长术;
Crown Lengthening
冠延长术;