直接和那個同事溝通是最好的選擇。但我不會說這些話。

這些話無異於挑戰，依LZ的溝通能力，幾乎是以卵擊石。應該盡量和這個同事成同盟，至少讓他不把LZ當敵人。

see if this is mild:

I enjoy working with you and everybody in this company. this positon has some challenges since I am new here and I am still in my learning phase. I will need help from colleagues like yourself to further improve efficiency. I would much appreciate it if you can provide realtime feedbacks to me. With your help and other colleagues, I expect to shorten my learning curve.

LZ can even offer help to this guy with expertise in certiain area to build up bond.