Cephalic, or head-first, is the first type, and furthermore the most common and optimal presentation for easy delivery is a type of cephalic presentation called vertex, which includes complete flexion of the head as well.

头先露，第一种类型；进一步说，对于顺产来说最常见、最佳先露，是一种称为顶先露头先露，包括完整头部俯屈。

If that bending motion decreases the angle of the joint and brings those bones together, like when I bend my arm together, that movement is called flexion.

如果弯运动减少关节角度，使骨骼结合在一起，就像我弯手臂一样，这种运动称为屈。

Nor does this—its amazing strength, at all tend to cripple the graceful flexion of its motions; where infantileness of ease undulates through a Titanism of power.

这种惊人力量，一点也不会削弱它运动时那种优雅线美，婴儿般轻松通过巨人般力量波动起伏地表现出来。

Then, we also have an electrical motor over here that controls this transmission that you can see that controls flexion and extension of the elbow.

之后，我们这里还有一个电机，它控制这个传输，你到它控制肘部弯和伸展。

Simply put it means to lift through the entire range a joint can safely articulate between full extension and full flexion.

简单地说，就是举起哑铃后，关节安全地活动全部范围，从完全伸展到完全起。

Think like the bicep curl where you want to start at the very bottom, elbows straight and at full extension, and then lift all the way to the top, elbow bent and at full flexion.

想象一下二头肌弯样子，从最下面开始，肘部伸直是完全伸展，然后一直抬起，肘部弯就是完全弯。

Then there's flexion, where the fetal chin presses against its chest as its head meets resistance from the pelvic floor.

接着是俯屈，胎儿颏贴近胸壁，因为他头遇到盆底肌阻力。

That's going to affect shoulder extension, flexion, all these sorts of things.

那将影响肩部伸展、屈等这些方面。

Now, when you're coming into that flexion, say the patient has anterior hip pain.

现在，当你进入屈动作时，比如患者有前髋疼痛。

If you look at the movement to those animals, even just the way they walk, whether or not they enjoy a flexion of the paw as they stride or whether or not they tend to stride differently.

如果你观察那些动物动作，哪怕是它们走路方式， 它们在迈步时是否享受爪子弯， 或者它们是否倾向于不同方式迈步。

Yen Hai, RoboCT's product director, said that the product assists with hip flexion and stabilizes the lumbar spine to help seniors walk with longer strides, quicker steps, and greater stability.

RoboCT产品总监颜海表示， 该产品有助于髋关节屈并稳定腰椎， 帮助老年人迈出更长步伐，更快步伐， 并提高稳定性。

Forearm Flexion: Lift your forearm while holding a light weight or a water bottle, focusing on using your forearm muscles.

前臂屈：举着轻量级或水瓶抬起前臂，专注于使用前臂肌肉。

To bear on the pad, on the knee pad, and with the flexion of your hips, create a compression.

将重量压在垫子上，压在护膝垫上，并通过髋部屈产生压缩力。

I want like in an ACL case, I want to make sure they're getting to full extension and good levels of flexion.

在前交叉韧带损伤情况下，我想要确保他们能够完全伸展并达到良好屈程度。

And so explain to me how you avoid impinging or pinching the front of that hip when you come up into flexion.

所告诉我，当你向上进入屈动作时，你是如何避免髋前部受到挤压或卡压？

The isometric was an elbow flexion, aka a bicep curl, at maximal contraction held for 3 seconds 10 times at a 20-degree flexion.

精力训练是做肘部屈，也就是二头肌弯，极限收缩保持3秒，20度屈10次。