周期: period; cycle; circle; revol ...元素: element; elementary substanc ...第2周期元素: period 2 element第3周期元素: period 3 element第4周期元素: period 4 element第5周期元素: period 5 element第6周期元素: period 6 element第7周期元素: period 7 element第8周期元素: period 8 element第9周期元素: period 9 element周期元素: period element; periodic element第1: stargate s7 e1 s7 e21周期: g 1第5元素: the fifth element第Ⅰ主族元素: the group ia elements第1版序: foreword to the first edition第1部: book one第1部分: basic lexicographical terminology-part; java web第1范式: first normal form 1nf; first normal form, 1nf第1方面军: japanese first area army第1话: saint seiya the hades chapter inferno; the hades inferno第1级卷: level 1 volume第1季: angel season 1; kyle xy season 1; the apprentice season 1第1阶段: phase 1 first phasee第1警戒线: first guard line
