I like to use an adjustable stem that my customers can use for a few days to try different positions for a long enough time to be meaningful.

我喜欢使用一个可调节的把立，它能够让我的顾客几天中在不同的位置花上足够的时间来下结论。

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The technique relies on an adjustable "microvalve" to build up layers of human embryonic stem cells (hESCs).

该技术依靠可调节的“微型阀”来制造出一层层的人体胚胎干细胞。

youdao

One selling point: Instead of an adjustable, long stem for a bike seat, Scott's seat posts are cut and bolted tight (by dealers in the store) to fit the rider.

FORBES: Spinning Wheels

The technique relies on an adjustable "microvalve" to build up layers of human embryonic stem cells (hESCs).

BBC: Edinburgh scientists use 3D printing to produce stem cells