life is brief.
liquid 液体
water . oil and milk are liquids.
he could not tell whether the substance was liquid or gas.
crowd n. 一群人，人群; vt. 挤满
i was dancing in the middle of the crowd.
我在人群里跳舞。
they should provide adequate support.
who can guarantee that his story is true?谁能保证她的话是真的？
pioneer n. 先锋，先驱
he was a pioneer of global captialism .
他是全球资本主义的先驱。
guarantee
i cannot guarantee you that all of this is gonna succeed.
pioneer
Thousands of pioneers went to the West. They took the Indians' land.
he was just truly a pioneer and way ahead of this time. 他真是个先驱，引领时代潮流。
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