（2）while 尽管，虽然

1. While these experiments are interesting and useful, it is important to remember that they may not always tell us much. 虽然这些实验有趣也有用，但是很重要的是要记住，这些实验也可能不会告诉你很多。 2. While he loves his students, he is very　strict with them. 虽然他爱他的学生，可是他对他们很严格。