If you prefer to stay in cheap hotels while travelling, make sure you can lock the door of your room from the inside.
如果你在旅行时喜欢住便宜的旅馆，一定要确保你能从里面锁上房间的门。
The lock creaked now from inside, and an old man opened the door.
锁从里面发出嘎吱嘎吱的声音，一位老人打开了门。
In the same way that chewing gum in a lock makes it hard to open your front door, fat particles inside muscle cells interfere with insulin's efforts to open the cell to glucose.
锁内的口香糖使得前门难以打开，同样地，肌肉细胞内的脂肪颗粒干扰胰岛素为葡萄糖打开细胞的努力。
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