But if you notice an increase in hair loss, the most common reason is a slight iron deficiency.

但是，如果你注意到脱发速度在加快的话，最常见的原因是有点轻微缺铁。

youdao

But if you notice your child doing this a lot (when he's not mimicking a cartoon character), he might have other vision problems.

但是如果你发现你家小孩经常斗鸡眼，而且并不是在模仿某个卡通角色时，就要注意了，他可能有别的视觉问题。

youdao

I know a lot of young kids use weird spellings like "b4" instead of "before." but if you notice, it's only those young kids who do that.

我知道很多小盆友喜欢用一些代替的词，比如用“b4”代替“before”，但是你有没发现，只有那些小盆友才会这么做。

youdao

"That was reassuring, but it also meant that if you were unidentified you had potential friendly fire not too far away at a moment's notice."

VOA: standard.2010.04.06

But you wouldn't notice the disgustingness if you just thought about the value of pizza in isolation and the value of chocolate in isolation.

但如果你单独考虑比萨饼的价值,和巧克力的价值,你就不会觉得恶心。

耶鲁公开课 - 死亡课程节选

Down here, I've just got two things to merge, and then I've got things of size two to merge and then things of size four to merge. But notice a trade off. I have n operations if you like down there of size one.

但是n的大小是不同的，是吗？在这里我们只要合并两个元素,然后是合并长度为2的列表,接下来是合并长度为4的列表,但是观察一下之间的权衡关系。

麻省理工公开课 - 计算机科学及编程导论课程节选

But, if you notice any problems with your vision, schedule an appointment with your eye doctor as soon as possible, even if you've recently had an eye exam.

CNN: Nearsightedness

We don't know if Google will offer these extra-personal discounts to the public at any point in the future, but if you suddenly notice a lot of follow-up bargains in Google Play, you'll know how they came to be.

ENGADGET: Google patents buyer-specific price drops for follow-up sales, can tell if you're a cheapskate

This sounds miraculous, and you will indeed notice and marvel at the difference, but only if you happen to be a snowy owl who likes watching voles from a hundred and fifty yards.

NEWYORKER: Ring Cycle