Learner's definition of LO
old-fashioned + literary
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used to call attention to something or to show wonder or surprise注意啦，瞧，看哪（用于引起注意或表示惊讶） -
Lo, the king approaches!注意啦，国王到了！
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the adventures we have shared for lo these many years瞧这么多年我们共同经历的冒险
lo and behold
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used to express wonder or surprise天哪，哎哟，真想不到（用于表达惊讶）—
often used in a humorous or ironic way常作诙谐或讽刺之意 -
She appeared on a magazine cover, and lo and behold, she began to get offers to star in movies.她上了封面杂志，天哪，之后就开始收到电影的片约了。
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We opened the door, and lo and behold, the delivery man had arrived.我们开了门，天哪，送货员已经到了。