Is aonad fad seann nòs a tha anns an troigh.
Tha i co-ionnan ri 305mm, ach an cainnt àbhaisteach cleachdar am facal "troigh" a chiall fad (neo doimhnead) "mu deidhinn 0.3m".
Anns a h-aon dòigh cleachdar am facal "òirleach" anns an latha an diugh le ciall de "mu deidhinn 25 mm" . Tha seo gu math cumanta air làraich togail. Mar eisimplir, càn gu bheil inneal-cladhaidh a gearradh claise agus am fear-fhaire a dh'innse ris an fhear-innil gu bheil feum aige a dhol beagan nas domhainn "Sìos mu deidhinn sia òirlich".
A bharrachd air sin, tha 6 troighean ann an aitheamh
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