under-, 在下面，pin, 别针，固定。引申义固定根基，加强。

1. Producers have, therefore, preferred term sales contracts to underpin upfront investment.

因此, 生产商青睐长期销售合约,以保证前期投资.

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2. That reality must underpin our partnership.

这一现实必须支撑我们的合作伙伴关系.

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3. That really must underpin our partnership.

我们的伙伴关系必须基于这一现实.

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4. There are, however, two secular trends that underpin the growth in the industry.

然而, 有两项长期因素支撑着这行业的增长.

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5. Candour has its place in foreign policy, but it requires a strategy to underpin the rhetoric.

在外交政策方面,坦诚很重要, 但这种言论必须有相应策略作为基础.

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