Sentence examples for are difficult to collect from inspiring English sources

In many machine learning settings, labeled examples are difficult to collect while unlabeled data are abundant.

That explanation would need to be tested with DNA samples, which are difficult to collect from fossils found in the arid Levant.

But marrow stem cells are difficult to collect and somewhat scarce; they must be isolated and then grown in culture before they're injected back into an injured heart.

DNA, the genetic marker found in hair and blood and other body fluids, can provide a more concrete link to a crime than fingerprints, which often are not left at a crime scene or are difficult to collect.

Implications to human health should be assessed through a holistic size-resolved characterization involving multidisciplinary research, which requires large uniform samples of dust that are difficult to collect using conventional atmospheric sampling instruments.

Even though they are difficult to collect – the nuts must be pried out of their prickly casings – my brother and I eagerly spent time out there gathering up the nuts knowing that the end result would far out weigh a few splinters and pricks to our fingers.

Because an adequate sample may be difficult to collect using a syringe, we tested collection using a sterile sponge.

Hard evidence on this is difficult to collect.

It is difficult to collect and curate personal data collected by activity-tracking apps.

And the numbers can be off simply because it's difficult to collect exact data mid-conflict.

However, in practical terms, it is difficult to collect fresh urine from individual animals in the field, especially from small animals.