When it comes to making friends, you cannot be too careful.
一谈到交朋友，你再怎么小心也不为过。
friends, it is with great pleasure that I introduce...
朋友们, 我很高兴地介绍...
Jane and Mary are good friends; the former is a teacher, the latter is a nurse.
珍和玛丽是好朋友，前者是老师，后者是护士。
