This is the 34th most frequent Indonesian word.
agar
"So that" or "in order to."
In this sentence, 'agar' expresses the purpose of studying diligently, which is to achieve good grades.
Saya belajar dengan giat agar mendapat nilai yang baik.
I study diligently so that I can get good grades.
Here, 'agar' indicates the condition needed to maintain the freshness of the plants.
Tanaman perlu disiram secara teratur agar tetap segar.
Plants need to be watered regularly in order to stay fresh.
In this context, 'agar' conveys the intention behind the design of the door, which is to block noise.