can - It's OK to do something., can't - It's not OK to do something., may - It's OK to do something (more polite), may not - It's not OK to do something (more polite), must - It's important you do something, mustn't - It's important you don't do something,

排行榜

視覺風格

選項

切換範本

恢復自動保存: ?