那个孩子看起来很瘦弱，需要多补充营养。

Nàge háizi kàn qǐlái hěn shòuruò, xūyào duō bǔchōng yíngyǎng.

That child looks very thin and weak and needs more nutrition.

他生了一场大病后，身体变得十分瘦弱。

Tā shēng le yī chǎng dà bìng hòu, shēntǐ biàn de shífēn shòuruò.

After a serious illness, his body became very thin and weak.

别看她瘦弱，跑起步来可快了。

Bié kàn tā shòuruò, pǎo qǐ bù lái kě kuài le.

Don't be fooled by her thin appearance; she runs really fast.