我一看到蝙蝠就把门闩上了。I had bolted the door the instant I had seen the bat.在中国，蝙蝠被视为吉祥物。In China bats are thought of as being very lucky.大多数蝙蝠靠回声定位来飞行。Most bats navigate by echolocation....
Many department stores have both elevators and escalators.许多百货公司既有电梯又有自动扶梯.The new store has escalators to carry customers from one floor to another.这家新商店有自动扶梯将顾客从一层楼面运送到另一层楼面.Shuanglong's stair - arm belt will brin...