Technically, back labor occurs when the fetus is in a posterior position, with its face up and the back of its head pressing against your sacrum, or the back of your pelvis.

从技术上来说，背阵痛发生在胎儿处于背对的位置，它的脸朝上而后脑勺紧靠你的骶骨或者骨盆后方。

youdao

Sit in your chair with your back tight against the chair back.

后背紧贴椅背。

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"We've had back to back wins, played well against some decent teams, and hopefully we're going on a run now, " said Finnan.

“我们在背靠背的比赛中都取得了胜利，和一些强队的对阵中表现出色，希望我们现在能迎来三连胜。”芬南说。

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The threat may be against their family back in their home country.

VOA: special.2010.06.14

I want to go back to the arguments for and against the redistribution of income.

我想继续回到对收入再分配问题,赞同与否的论辩。

耶鲁公开课 - 公正课程节选

Well, I actually think the Russian formalists can be defended against the charge that, unbeknownst to themselves, they fall back in to form-content distinctions by insisting on this variety of dualities.

但是我认为,这些形式主义者们在不自觉中，对于形式和内容的双重性,太过偏执。

耶鲁公开课 - 文学理论导论课程节选

To get an idea, it helps to see 48 fps back-to-back against 24 fps video.

ENGADGET: Editorial: Despite shaky 48 fps Hobbit preview, high frame rates will take off

Last season's beaten play-off finalists now face back-to-back games against promotion contenders MK Dons and Leicester City.

BBC: No crisis at Leeds - McAllister

In back-to-back victories against the Jazz and the Wizards this month, Novak shot 10 of 17 from three-point range.

WSJ: The Knicks Are More Than Just Jeremy Lin