1、She's a real copperbottom, always sticking to her goals no matter what challenges she faces.
她是个真正的决心坚定的人，无论面临什么样的挑战，她总是坚持自己的目标。
2、The ship was built with a copperbottom to prevent the growth of marine organisms on the hull.
这艘船的船底用铜制成，以防止船体上生物的滋生。