trithalliumWiktionary 原文构词拆分tri-前缀Three. · (chemistry) Used for the digit three to form systematic element names of elements whose existence has been predicted, and which have not yet been given a trivial name.+thallium词根/词干词源说明From tri- + thallium.释义（英文）名词 Noun(chemistry, in combination) Three thallium atoms or cations in a molecule (Tl3)