xiǎo / tōu / cóng / hòu / mén / qián / jìn / dà / lóu / tōu / zǒu / le / jǐ / tái / diàn / nǎo小偷从后门潜进大楼,偷走了几台电脑。The thief infiltrated the building through the back door and stole several computers.