( ( A solution ) ( ( contains ( ( ( a mixture ) ( of ( ( ( two or ) more ) substances ) ) ) ( which ( ( ( can not ) easily ) ( be ( distinguished ( from ( one another ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (DT A) (NN solution)) (VP (VBZ contains) (NP (NP (DT a) (NN mixture)) (PP (IN of) (NP (QP (CD two) (CC or) (JJR more)) (NNS substances))) (SBAR (WHNP (WDT which)) (S (VP (MD can) (RB not) (ADVP (RB easily)) (VP (VB be) (ADJP (JJ distinguished) (PP (IN from) (NP (CD one) (DT another)))))))))) (. .)))
A solution contains a mixture of two or more substances which cannot easily be distinguished from one another.
(ROOT (S (NP (DT All) (NNS solutions)) (VP (VBP contain) (NP (QP (IN at) (JJS least) (CD two)) (NNS substances))) (. .)))