Isotony
同中子素現象
??? 情景例句
Please accept my apology for not neeting you for lunch Tuesday.
我很抱歉，星期二沒有與你一起共進午餐。
If the old dog barks,he gives counsel.
老狗叫，是忠告。
Oh dear! I must go. Have a good day!
哎呀！我得走了，再見。