costly
adjective uk/ˈkɒst.li/ us/ˈkɑːst.li/
(EXPENSIVE)
昂贵的，值钱的
expensive, especially too expensive
a costly item 一件昂贵的商品
a costly purchase 花大价钱买来的东西
The project was subject to several costly delays/setbacks. 该工程经历了几次代价昂贵的拖延／挫折。
(DAMAGING)
造成重大损失（或破坏）的
involving a lot of loss or damage
Building this bridge has already been too costly in terms of lives (= people have been killed while working on it). 就建这座桥付出的生命而言，造这座桥的代价已经太高了。