这块镜片一面平,一面凸,安装时不能装反。Zhè kuài jìngpiàn yí miàn píng, yí miàn tū, ānzhuāng shí bù néng zhuāng fǎn.One side of this lens is flat and the other is convex, so it must not be installed the wrong way round.
这块地中间凸起来一块,走路要小心。Zhè kuài dì zhōngjiān tū qǐlái yí kuài, zǒulù yào xiǎoxīn.There is a raised bump in the middle of this ground, so watch your step when walking.
他瘦得厉害,锁骨都明显凸出来了。Tā shòu de lìhai, suǒgǔ dōu míngxiǎn tū chūlái le.He is very thin, and his collarbones clearly stick out.