There are also what we call subtle expressions - not brief, but very small, almost imperceptible.

还有一种表情我们叫做细微表情，它不是简短型的，而是非常微小，几乎无法察觉。

youdao

The differences are usually subtle, but if they are not bridged from the beginning, they can turn out to be very difficult to fix in the end.

通常这些不同之处是微妙的，但如果开始时不解决这些的差别，到后来有可能会很难解决。

youdao

“Having a woman in that mix changes the dynamic,” she said, “and it's actually not even subtle. It's very obvious.

她说：“在那群人里有个女人就会改变其活力，这甚至并不微妙，而是非常明显。”

youdao

"It is not very subtle. These are schools with teachers and textbooks that are overtly anti-Western, anti-Christian,anti-Jewish Islamic supremacy."

VOA: standard.2010.07.12

You realize it's very subtle, because the very first thing in that equation, which is m, has not yet been defined.

你会觉得这很微妙,因为方程里最基本的量 也就是 m,还没有人给它下定义

耶鲁公开课 - 基础物理课程节选

The not-very-subtle threat is that if they back Tsipras, they will be out on their ear.

CNN: What if Greece can't manage payback?

It is such whiffs of Welsh triumphalism that English-only speakers object to the not-very-subtle implication that the only real Welsh are those who speak the language.

ECONOMIST: The Welsh language

The service can be switched off at a later date, and it is an opt-in service, so Facebook are not doing anything wrong, but they are being very subtle with the activation message.

FORBES: Facebook's Photo Sync Could Cost Mobile Users A Lot Of Money