unique前面用a还是an _发音的单词

新东方托福网为学生强烈推荐有关“a"和"an"冠词的恰当用法，牵涉到其追随专有名词后是不是有元音音标发音的单词：
English has two forms of the indefinite article: a and an.

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In modern usage, the form a is used in front of words that begin with a
consonant sound; an is used in front of words that begin with a vowel sound.
The following uses of an are nonstandard in modern English:
OK, I admit it, I don’t see why the iPad would be an useful device.
Plot is an unique feature that indicatesthe address of the place.
Found an useful paper on grid generation
Fastest way to find an unique element outof given numbers
We are an uniform based school and the design of our uniforms has been a
careful and consultative process withexecutive, staff, student and
community.
It may be that writers who put an infront of unique or usefulhave mis-understood the rule; perhaps they think that an goes in front of any word that
begins with u, regardless of how the u is pronounced.
Although the letter u usually represents a vowel sound, it does not always
do so. Such words as umbrella, undertaker,and ugly do begin with a vowel sound,
[uh]. These words should be preceded by an:
an umbrella
an undertaker
an ugly dog
Sometimes, u represents aconsonant sound that incorporates the y sound
heard at the beginning of yellow:
unique[yoo-neek]
useful[yoos-ful]
usual[yoo-zyoo-l]
I’ve never heard any one pronounce the word an in front of one of these
【unique前面用a还是an】words, although I suppose that somewhere in the world someone may talk that way.
For a speaker who pronounces the word unique as[uh-neek]or[oo-neek], there
would be some justification for writing “anunique feature.”
What I think is that some speakers say “auseful paper” but go to write it
and think it “looks funny”with a instead of an.
In the case of an beforea word that begins with u, let your ear guide
you:
a useful device, but an unusual device
a unique feature, but an ultra-interesting feature
a useful paper, but an undervalued paper
a unique element, but an unknown element
a uniform-based school, but an unconventional school
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