Example sentences of "[adv] difficult to obtain [coord] " in BNC.

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1 Characteristically , the data used may be more difficult to obtain and are usually more spatially aggregated ; modelling software which permits feedback loops is essential ;
2 They are emphatically against making divorce more difficult to obtain and unsympathetic to the idea that society should do more to protect marriage .
3 Imaging of organs that are characterised by periodic motion , such as respiration or the beating heart are more difficult to obtain and require synchronisation of the MRI scanner with , for example , the QRS signal of the ECG waveform .
4 Information is usually difficult to obtain or unreliable in less-developed countries , and the problem is obtaining enough of it that is relevant and trustworthy .
5 An alternative to water in sprays is needed in the tropics where water is often very difficult to obtain or transport to the field ; it evaporates so rapidly that the effectiveness of sprays is further reduced .
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