There is one thing I need to estimate first –the area of contact between the ground and the bubble wrap.
当然，还有一件东西是我们必须首先考虑的——那就是地面与汽泡纸接触面的大小。
2
The problem is difficult because BPA is used for most types of plastic foil in which you wrap food. Thus, a direct contact with the body is established and it occurs on a daily basis.
更困难的是，BPA是最常用在保鲜膜中的原料，人们每天都不可避免的会有直接接触。
3
Do not wrap it with conduct material to avoid the damage caused by the direct contact between the metal and battery. Keep the battery in day places.