我来做次雷锋，不难https://www.bing.com/images/search?q=bi-fold+window&qpvt=bi-fold+window&FORM=IGRE
https://www.bing.com/images/search?q=bi-fold+window+singapore&qpvt=bi-fold+window+Singapore&FORM=IGRE
http://www.doctordoors.com.sg/contact-us.html
建议选UPVC的， 不会破或者不怕破， 也轻有便宜
再来
https://www.localglazingprices.co.uk/how-much-are-upvc-bifold-windows/
https://sapphire.com.sg/why-upvc/
https://www.rehau.com/sg-en/architects-consultants/windows-and-doors/why-rehau-upvc#tab3
大力推广
https://sapphire.com.sg/why-upvc/
https://www.rehau.com/sg-en/architects-consultants/windows-and-doors/why-rehau-upvc#tab3
大力推广
Huasing Association 1999 - 2013