Pour beer into a small container, such as an old tuna fish can. Bury the container in you garden or near the place where you saw the snails, but leave at least 1 inch (2.5 cm) above the soil. The smell of the beer will attract the snails, which will drown in the container.  Adding yeast will make the traps more enticing to the snails. You may need to put out multiple traps, as they will only be effective for snails that are close by. Other great options for your beer container include a plastic cup, yogurt cup, bowl, or pie dish. Don’t bury your beer trap at soil level, as other beneficial bugs might accidentally die in it. Snails are most active in the early morning or at night, so this is the best time to go snail-picking. Put the snails in a bucket or container to move elsewhere.  You might also decide to kill the snails. To make the process quicker, you can put an overturned pot or bowl in your garden or near the area where you’ve seen the snails. The snails will likely hide under the pot, which makes it easy for you to find them. The caffeine in coffee negatively affects snails, so they’ll die if you spray them with coffee. However, you have to drench the snail for it to die, so make sure you spray it a lot. Make your own coffee spray by brewing a pot of coffee, then letting it cool. Put the coffee in a spray bottle to use around your garden or home. Spritz the garlic spray around your garden, yard, and home, as needed. If you spot a snail, you can drench it with the garlic spray. It may kill some snails, and it will also deter them away. To make your garlic spray, soak 3 crushed garlic cloves in 1 tablespoon (15 mL) of vegetable oil overnight. Then, strain the liquid into 1 litre (4.2  c) of water. Pour the mixture into a spray bottle. Add 1 teaspoon (4.9 mL) of liquid soap to the solution, then shake the bottle before using. Iron phosphate is a molluscicide, which means it kills snails and slugs. Simply place the trap in your garden or near the location where you’ve noticed snails, and they’ll be...

TL;DR in Chinese:
用啤酒捕捉蜗牛。 如果你有时间，可以动手抓住蜗牛再放逐。 用冷咖啡喷杀蜗牛。 自制大蒜喷剂来驱赶蜗牛，或许还能杀死它们。 用磷酸铁杀死蜗牛。 用含有乙二胺四乙酸铁钠的杀软体动物剂迅速杀死蜗牛。 养一只鸡来帮忙吃掉蜗牛。 鼓励蜗牛天敌住在你的花园或庭院。