英语
德语
德语
英语
单语范例（未经PONS编辑处理）
Most vowels have two prominent allophonic realizations, depending on whether it occurs in a stressed or unstressed syllable.
en.wikipedia.org In a sequence of two or more syllables with, unstressed can also be lowered to but it is otherwise.
en.wikipedia.org Unstressed may become more central if it does not merge with.
en.wikipedia.org They need regularly exercise, such as going for a long walk, jog or run freely at a safe area to stay unstressed and healthy.
en.wikipedia.org Usually it also follows a reduction of the unstressed vowel.
en.wikipedia.org