In his journal, Henry David Thoreau wrote, "My profession is always to be on the alert to find God in nature, to know his lurking places, to attend all the oratories, the operas in nature."

亨利·大卫·梭罗在日记中写道：“我要做的就是时时刻刻从自然中发现上帝的存在，了解他在自然中隐藏的地方，观赏在自然界中上演的所有演讲和华丽的歌剧演出。”

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As users, then, we can only detect viruses as we can, update our virus detection files religiously, armor systems as much as possible, be extremely cautious of email attachments, and always be on the alert.

CNN: Technology - Analysis: Understanding viruses

Investors now know that funds are not inherently safe and that they should always be on the alert for self-dealing by advisers, brokers and other intermediaries.

FORBES: The Great Mutual Fund Clean Up That Almost Happened (April 4, 2004 )

Thus, policymakers and informed citizens always need to be on alert for exaggerated claims regarding the benefits of Medicaid expansion.

FORBES: Will Medicaid Expansion Create Jobs?