The phrase "and are therefore unable" is correct and usable in written English.
It can be used to explain a consequence or result of a previous statement, indicating a lack of ability due to certain circumstances.
Example: "Due to the unforeseen circumstances, we are unable to proceed with the project as planned, and are therefore unable to meet the deadline."
Alternatives: "and thus cannot" or "and as a result are not able to".
Thus, there will always be some fibres that end in the wrong destination and are therefore unable to function.
Trivers suggests that this is because most people who have Alzheimer's disease are unable to anticipate the future and are therefore unable to prepare for it).
Many of the young people confined to institutions have been wrongly labelled disabled and are therefore unable, under limited government legislation, to be considered for fostering with families.
(The nations of the euro area individually are very open but they mostly trade with each other and are therefore unable to devalue against their most important partners).
Passive immunization provides antibodies to persons who suffer from B-cell deficiencies and are therefore unable to make antibodies for themselves (see immune system disorder: Immune deficiencies).
This is largely because many of the residents work informally, and are therefore unable to secure the documents needed to rent outside the villas.
Typical problems include customers finding their provider refuses to release them from their contract despite not receiving a signal in their area and are therefore unable to make or receive calls, let alone use the internet.
Lennons said: "In light of the liquidation of Tullett Brown Limited, we are not in a position to take instructions and are therefore unable to comment on your questions".
Young people we speak to say they are not being given enough information about bursaries they may be entitled to and are therefore unable to make a sensible decision about where to apply".
In Cornwall the unemployment rate is 5% and many people work in low-paid seasonal jobs in the tourism industry, and are therefore unable to afford the rising asking prices.
We have never been approached by Marlon King or his representatives for such assistance and are therefore unable to rely on any information other than the conviction and sentencing yesterday".
