Desserts can be substituted by a portion of fresh fruit.

甜点可以替换成一份新鲜水果。

《柯林斯英汉双解大词典》

Give a portion of each day to recreation.

每天抽一部分时间用于娱乐。

《新英汉大辞典》

A titanic impact could have stripped away a portion of its rocky mantle, leaving behind a metallic core whose density is out of proportion with the original ratio of rock to metal.

超大碰撞可能剥去了水星的一部分岩石地幔，留下了一个金属核心，其密度与原来的岩石与金属的比例相比大得不成比例。

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We have come to dedicate a portion of that field, as a final resting place for those who here gave their lives that that nation might live.

VOA: special.2009.11.12

And this one will be particularly germane to a portion of Problem Set 1, at least in Problem Set 1.

这个程序跟习题集1中的,一部分比较相似，至少在习题1中。

哈佛公开课 - 计算机科学课程节选

For example, a portion of pasta according to the U.S. Department of Agriculture would be about the amount of pasta that would be the size of a tennis ball.

比如说,意大利面的每日摄入量,根据美国农业部,是如此的份量,大概和网球一样大小

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

The tax break excluded a portion of capital gain realized upon the sale of certain businesses.

FORBES: North Carolina's Threat To Tesla Likely Unconstitutional

Only one other state, Alaska, has loser-pays, and only for a portion of fees.

ECONOMIST: Tort reform

Can a portion of guilt be shared by the shrink who prescribed the pills?

WSJ: Pleasure Pill | Side Effects | Identity Thief | Lore | Film Reviews by Joe Morgenstern