thirdly是第三。
Thirdly, pay attention to your opponent's leg movements.
第三点要注意对手的腿部动作。
Thirdly, the company's entry and exit requires the production of documents.
第三,公司的进出需要出示证件。
Thirdly, we still need a sum of project funds at present.
第三,我们目前还差一笔项目资金。