Firstly, I want to thank everyone for coming.

Pertama sekali, saya ingin mengucapkan terima kasih kepada semua yang hadir.

We need to consider several factors: firstly, the cost; secondly, the time; and thirdly, the resources.

Kita perlu mempertimbangkan beberapa faktor: pertama, kos; kedua, masa; dan ketiga, sumber.