pay off 報いる

thwart 妨げる

How Female Hummingbirds Thwart Male Harassers

https://www.theatlantic.com/science/archive/2021/08/female-hummingbirds-look-like-males/619893/

Perimeter 周囲 circumference

Two powerful bomb blasts have struck the perimeter of Kabul’s Hamid Karzai International Airport, as civilians continued to seek to escape on flights from Taliban-controlled Afghanistan.