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(jī)器好好加油的話，它就不會(huì)正常運(yùn)轉(zhuǎn)。
2. The heater in my car doesn't work properly.
   我汽車(chē)?yán)锏呐瘹庠O(shè)備出了點(diǎn)毛病。
3. That is not, properly speaking, a dictionary but a grammar book.
   嚴(yán)格地說(shuō)，那不是一本字典，而是一本語(yǔ)法書(shū)。
4. I'm learning German, but I still can't speak it properly.
   我正在學(xué)習(xí)德語(yǔ)，但還說(shuō)不好。