tā / bǎ / àn / mǎ / xiě / zài / zhǐ / shàng / rán / hòu / mǎ / shàng / bǎ / zhǐ / sī / diào / le

他把暗码写在纸上，然后马上把纸撕掉了。

He wrote the secret code on a piece of paper and then tore it up immediately.