It's the same glass, more or less, that is used for the Windows in your home and the jar of jam in your fridge - and that old elixir bottle you bought at an antique store.
这与你家的窗玻璃、冰箱中装果酱的广口瓶或者从古董商店淘来的炼金瓶的材料并无二致。
3
Explain that the air around them presses against everything and likewise presses down on the water in the jar, forcing the water up the neck of the bottle when atmospheric air pressure rises.