zhè / ge / fēn / zǐ / de / zhí / jìng / dà / yuē / shì / 1 / āi / mǐ / , / fēi / cháng / wēi / xiǎo / 。这个分子的直径大约是1埃米,非常微小。The diameter of this molecule is about 1 angstrom, which is extremely tiny.