副詞 properly:

1. in the right manner
   同義詞：decently, decent, in good order, right, the right way
2. with reason or justice
   同義詞：by rights

1. The machine won't function properly if you don't oil it well.
   如果你不給機器好好加油的話，它就不會正常運轉。
2. The heater in my car doesn't work properly.
   我汽車里的暖氣設備出了點毛病。
3. That is not, properly speaking, a dictionary but a grammar book.
   嚴格地說，那不是一本字典，而是一本語法書。
4. I'm learning German, but I still can't speak it properly.
   我正在學習德語，但還說不好。