Lau Sie Lung has been engaged in sales for about 9 years, primarily focusing on the sales of supplements.

He also actively participates in non-profit organizations. He has been the Naib Pengerusi of Persatuan Perlindungan Dan Prihatin Pengguna Malaysia (PPPP Malaysia) since 2018. In 2023, he was also selected as the Vice President of MCC-GB.

Sure, here is the translation in Chinese:

刘世龙（Lau Sie Lung）从事销售工作约9年，主要专注于营养保健品的销售。

他还积极参与非营利组织的工作。自2018年以来，他一直担任马来西亚消费者保护和关怀协会（PPPP Malaysia）的副主席。2023年，他还被选为MCC-GB的副主席。