These types of industries require higher quality labor. For example, people working in industries with low-dust and low-static electricity environments must at least have rudimentary English. Therefore, such industries cannot really absorb middle-aged women who only graduated from primary school twenty years ago and can perhaps only recognize a few letters.
這些產業要求的人力素質較高，例如要遵守防塵防靜電的作業程序，還要能粗通英文，因此廿年前國小畢業，英文字母不認識幾個的中年女工，就難以被吸收。