The boat is now leaning at a 30 degree angle.

这条船现在正以30度角倾斜着。

《柯林斯英汉双解大词典》

Your arms should be at a 90 degree Angle.

你的手臂应该是成90度。

youdao

Your front knee should be at around a 90-degree angle.

左腿膝盖弯曲，约成90度角。

youdao

May hurt a little bit, but try as much as possible to create a 90 degree angle.

可能有点痛，尽可能形成一个直角。

哈佛公开课 - 幸福课课程节选

Now take these two fingers-- the middle finger and the thumb-- and as much as possible, from that 90 degree angle, create a circle.

再让这两个手指-,中指和姆指-,尽可能保持直角时围成一个圆圈。

哈佛公开课 - 幸福课课程节选

So-- if you don't feel comfortable doing it, don't do it-- what I'd like to do now is as following: Take your thumb and your middle finger and create as much as possible a 90 degree angle.

感觉不舒服的，就不要做，希望按下面的指示做：,让你的姆指和中指,尽可能形成一个直角。

哈佛公开课 - 幸福课课程节选

The machines can also tilt so that they lie at a nearly face-up 80-degree angle.

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Instead, place your notes on one side of the lectern at a 90 degree angle.

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These opposing attempts to go at a 45-degree angle counterbalance into a 90-degree movement.

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