tǐnɡ
笔挺
bǐ tǐng
perfectly straight; ramrod straight
挺立
tǐng lì
to stand upright; to stand erect
挺然屹立（坚强地直立着）。
tǐng rán yì lì (jiān qiáng de zhí lì zhe)
to stand firm and upright (standing straight and strong)