Or perhaps someone will casually glance through your credit card purchases or cell phone bills to find out your shopping preferences or calling habits.

　　分析主干：someone will glance...

　　本句是個簡單句，謂語動詞glance 后接介詞短語through purchases or bills。不定式短語to find out...在句中作狀語，表示 無意中一瞥 的結果。

　　譯文：或者有人會隨意翻閱你的信用卡購物單或手機話費單，以此來了解你的購物喜好或通話習慣。