他一听到换人的哨声，就立刻准备上场。

Tā yì tīngdào huànrén de shàoshēng, jiù lìkè zhǔnbèi shàngchǎng.

As soon as he heard the whistle for substitution, he immediately got ready to go on the field.

每天晚上都有士兵在门口站岗放哨。

Měitiān wǎnshang dōu yǒu shìbīng zài ménkǒu zhàngǎng fàngshào.

Every night there are soldiers standing guard and keeping watch at the gate.