xiǎo / shēng / yì / diǎn / gé / bì / yǒu / ěr / bié / ràng / bié / rén / tīng / jiàn / wǒ / men / de / jì / huà

小声一点，隔壁有耳，别让别人听见我们的计划。

Keep your voice down; walls have ears, so do not let others hear our plan.