-tach-

钉,扣件
attach

vt. (to)系上,贴上,缚上,把…固定,使依恋,使依附

attachment

n. 附件,附加装置

detach

v. (from)拆开,分开

detachable

adj. 可分开的,可拆开的   

detachment

n. 脱离,分离,拆开;超然,脱俗,不偏不倚,客观;派遣,特遣舰队,分遣队