To seal a self-made keychain, you can use a clear sealant or resin. First, make sure your keychain is completely dry and free of any dust or debris. Then, apply a thin layer of the sealant or resin over the entire surface of the keychain, making sure to cover all sides and edges. Allow it to dry completely according to the product instructions before using the keychain. This will help protect your keychain from wear and tear and give it a shiny, finished look. **

To seal a self-made keychain, you can use a clear sealant or resin. First, make sure your keychain is completely dry and free of any dust or debris. Then, apply a thin layer of the sealant or resin over the entire surface of the keychain, making sure to cover all areas evenly. Allow it to dry completely according to the product instructions before attaching it to your keys. This will help protect your keychain and keep it looking new for longer. **

It ultimately depends on personal preference and what you would use more often. If you find yourself needing a pen frequently, then a pen would be the more practical choice. However, if you are someone who frequently loses or misplaces keys, then a keychain might be the more useful option. Both items can be functional and stylish accessories, so it's really a matter of what you would get the most use out of. **

To return a dress from Lightinthebox, you will need to first log in to your account on their website and go to the "My Orders" section. Find the order containing the dress you want to return and click on the "Return & Refund" button. Follow the instructions provided to select the reason for the return and submit your request. You will then receive further instructions on how to return the dress, including the return address and any additional requirements. Make sure to carefully package the dress and send it back within the specified timeframe for a refund or exchange. **

To return an item at Lightinthebox, you will need to first log in to your account and go to the "My Orders" section. Find the order that contains the item you want to return and click on "Return & Refund" to start the return process. Follow the instructions to select the item you want to return and the reason for the return. After submitting the return request, you will receive further instructions on how to send the item back and receive a refund or exchange. **

Yes, one can program AI using the C programming language. While C is not as commonly used for AI development as languages like Python or Java, it is still possible to implement AI algorithms and models in C. C's performance and efficiency make it a good choice for developing AI applications that require high computational power and speed. Additionally, there are libraries and frameworks available in C that can help with AI development, such as TensorFlow C API or OpenCV. **

Without further information or context, it is difficult to determine if the keychain is broken. If you can provide more details about the issue with the keychain, such as a description of the damage or malfunction, I would be happy to help assess the situation. **

At Lightinthebox, the return process is fairly straightforward. Customers can initiate a return within 14 days of receiving their order by contacting customer service and providing the necessary information. Once the return is approved, customers can then ship the item back to the designated return address. After the returned item is received and inspected, a refund will be issued to the original payment method. It's important to note that certain items may not be eligible for return, so customers should review the return policy before initiating a return. **