馬上開始。

Start now.

Source: Tatoeba

Sentence Composition

1 馬上 mǎshàng
  1. at once
  2. right away
  3. immediately
  4. on horseback (i.e. by military force)
2 開始 kāishǐ
  1. to begin
  2. beginning
  3. to start
  4. initial

classifier: 個