The first question, the word l' étudiant is actually two words, and the prototype is le étudiant. When two vowels are together, you should omit the first vowel and replace it with'.

Second, pronunciation should be recited jointly.

Third, it is the problem of yin and yang. Adding ",-e" is negative, indicating female college students; If not, it is a male college student. Generally speaking, la or le is yin and yang, but in this word, both words are vowels, so it depends on whether the noun behind it is added with -e to distinguish its yin and yang.