commercial [k?'m???l]

adj. 商業的;貿易的;營利的;靠廣告收入的; n. （電臺或電視播放的）廣告;

com共同+merc交易+ial...的→共同交易的→商業的

letter ['l?t?]

n. 信;證書，許可證;字母，文字;字面意義; vt. 用字母標明;寫字母于;加標題; vi. 寫印刷體字母;

of [?v]

prep. 關于;屬于…的;由…制成; aux. 助動詞 [非標準用語、方言] =have [主用于虛擬語氣];

credit ['kr?d?t]

n. 信譽，信用;[金融]貸款;榮譽;學分; vt. 相信，信任;歸功于;[會]記入貸方;贊頌;

cred相信，信任+it表名詞 → 信任；學分

Thank you, Grandpa.

謝謝你， 爺爺。

Excuse me I don't know.

對不起我不知道。

when they would be capable of providing information about traffic jams and suggesting alternative routes, when they would be used in hospitals to help doctors to diagnose illnesses, when they would relieve office workers and accountants of dull, repetitiv

計算機可以使辦公室人員和會計免除那些枯燥、重復的勞動。