Lingering touch is a huge sign that a woman is interested in you! If she reaches out to touch your hand while you’re talking, offers to fix your hair, or brushes her hand against your arm, she might think of you in a romantic way.  If you aren’t comfortable with being touched, simply let her know that it makes you uncomfortable and you’d like her to stop. If she’s a good friend, she’ll respect your boundaries. Some women are naturally flirty. Try to pay attention to her around other people to see if she touches them in the same way. If she does, she might just be a flirtatious person! When women are interested in someone, they normally go out of their way to be helpful toward them. If she offers to help you with things around the house, gets you a small gift, or wants to get dinner for you, she probably views you as a romantic interest.  If you’re also interested in her, be sure to thank her and try to reciprocate her kindness by being helpful, as well! If you aren’t interested in her romantically, try to politely decline her offers, but thank her for her kindness. You could say something like, “That’s okay, I think I have it under control, but thanks so much for offering!” Although she might laugh and smile around her other friends, pay attention to whether she’s consistently happy and giggling around you. She might be trying to flirt with you, or show you that you make her happy! She might even laugh at jokes that you make that aren’t particularly funny. If she’s laughing when no one else is, it’s a good sign that she likes you. While some women are really great listeners, if she’s interested in you, she’ll go the extra mile and make note of the things that are important to you. When you’re hanging out, she might say something like “Oh, that green shirt is so nice, and it’s your favorite color!” If she’s really serious about you, she might even get you a small gift that has to do with one of your interests or a story that you told her. For a woman, introducing a love interest to her family is a huge step...

TL;DR in Chinese:
注意她是否触摸你的手、头发或者手臂。 注意她是否想要照顾你。 当她在你身边时，注意她是否在笑。 考虑一下她是否注意并且记住了你对她说的话。 等她把你介绍给她的家人。