help on homework!!!

You may refer to the following article for some useful ideas:

How To Choose and Apply A Sunscreen When buying sun protection, check the label for sunscreens that work against both UVA and UVB for superior protection. You WANT BOTH! Then check out the level of protection: is it a 15 or 30 or 30+?

Sunscreens can be used as all-over skin protection or can spot-protect sun-sensitive areas such as the ears, nose, scalp, and cheeks. They can be excellent moisturizers for all skin types and help to promote healing of dry skin. Their non-irritating formula should be safe for sensitive facial skin and shouldn't clog pores.

Because some are waterproof, rub proof, and sweat proof, you can maintain your skin's natural beauty while out in the sun and enjoy every minute of it. Insist that it's PABA-free. It should have a non-irritating formula that moisturizes and restores as it protects with skin-essential vitamins, minerals, and amino acids.

A product that is labeled SPF 15, provides 2 hours of water / perspiration resistance and is effective for most active people. Lotions labeled SPF 30 should include the same superior, nourishing formula contained in with an added ingredient to provide a full 4 hours of water / perspiration resistance.

Sunscreen should be liberally applied to all exposed skin surfaces and reapplied periodically, particularly after swimming or in periods of heavy perspiration. Apply it fifteen minutes before going out in the sun or before exposure to sunlight and be generous with its application. Apply it regularly and hang out in shady spots whenever possible. Always limit your sun exposure during the hottest hours of the day, particularly between 10 a.m. and 4 p.m. Don't forget the eight glasses of water a day! And the hat!


2007-02-13 15:03:29 補充：
you are welcome

點止一分鐘