高昂的医疗费用、急诊室里漫长的等待，以及找不到初级护理医师，这些都只是患者每天面临的问题的冰山一角。
Crippling health care bills, long emergency-room waits and the inability to find a primary care physician just scratch the surface of the problems that patients face daily.
虽然海底甲烷排放确实令人担忧，这仅仅是冰山的一角：石油工业每天仅其日常运作就对全球变暖造成极大影响。
And while underwater methane emissions are certainly worrying, this is just the tip of the iceberg: every day, the oil industry contributes to global warming simply through its routine operations.
每天晚上，当我们入睡时，我们即切断了和位于冰山一角的‘意识’的联络。
Every night when we sleep, we disconnect from our conscious tip of the iceberg.
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