“金属环”怎么读

“金属环”的英语可以翻译为：ecket，beckett，ferrule ...

金属环把橡皮头固定到每一根铅笔上.A ferrule and eraser are crimped into place on each pencil.罗杰把绳子牢牢地拴在金属环上.Roger made the rope fast to the metal ring.常用的是变价金属环烷酸盐和异辛酸盐.The common driers are metal octoate and metal naphthenate....