偵事一二 動機。永遠是一切的起源。 笑看風雲，全因妳在背後！

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• Start with a 7″ x 16″ piece of tightly woven fabric.
• Fold in 3/8″ along a short end and sew.
• Repeat on the other side.
• Fold the fabric in half, right sides facing each other.
• Sew about 1 1/2″ from each side.
• Fold the top over about 1″.
• Tuck one end of an 8″ piece of elastic into a corner and sew.
• Tuck the length of the elastic inside, and repeat on the other corner.
• Repeat on the other side. Trim excess elastic

Turn the mask inside out. Pleat and pin the mask. Make sure the completed mask is between 4″ and 4 1/4″ from top to bottom.

• Stitch close to the edge to secure the pleats and elastic in place.
• Repeat on the other side.
• You have the option of placing a filter into the mask’s pocket.

If you’re using a cloth mask, wash it frequently and hang it in the sun to dry if possible, advises Raina MacIntyre, an epidemiologist and doctor at the University of New South Wales in Sydney, who has done extensive research on the usefulness of masks. Each person in your household should have several masks so you always have one to wear when others are in the wash.

Also, make sure you’re wearing your mask correctly, including being careful when you put it on and take it off. Follow these guidelines so you don’t inadvertently increase the risk of infecting yourself or others.