Slight tapping with a mallet may be required, but do not change the valve stem position.

如果需要，用木槌轻轻敲打，但是不要改变阀杆 位置。

youdao

The stem can be installed in any position, but if a choice of stem positions exists, good practice dictates that the valve be installed with the stem horizontal.

阀杆可以安装在任何位置，但是如果能够选择阀杆位置的话，实践表明将阀杆水平安装在阀门上是最好的方式。

youdao

This will entail getting into a comfortable stem, face position, or jam, with both feet at a similar height, such that gravity isn't pulling you to one side.

这就需要找到两脚高度基本持平的一些舒适位置(stem face position jam)，由此防止重力使你的身体偏向某一侧。

youdao

The danger in Obama's words is that they did not stem from a political position that is subject to change according to state interests.

BBC: Palestinian, Israeli press disagree over Obama speech

Considering that my position specifically involves STEM I suggested aquaponics.

WHITEHOUSE: Every Opportunity

Biden's support of stem cell research is at odds with the position taken by the Republicans' vice presidential nominee, Alaska Gov. Sarah Palin, whose 5-month-old son, Trig, has Down syndrome.

CNN: Biden's comments on special needs kids called 'new low'