Applicants must be proficient in Excel and comfortable working with large financial spreadsheets.

應徵者必須熟練使用Excel，並能自在處理大型財務試算表。

Our new customer service rep is proficient in Japanese, so she handles calls from Tokyo.

我們新來的客服專員精通日文，所以由她負責處理來自東京的來電。

After two years in shipping, Mark became proficient at tracking delayed international freight.

在貨運部門工作兩年後，馬克已能熟練追蹤延誤的國際貨物。