Sentence examples for samples are difficult from inspiring English sources

Sometimes, depending on the consistency of the sediment, the core samples are difficult to obtain.

In many classification cases, the labeled samples are difficult to acquire.

In this case, so many i.i.d and target-free training samples are difficult to be obtained.

Unfortunately, lavas are prone to weathering, so fresh samples are difficult to obtain for the geological past.

The reasons are that the preparation techniques of samples are difficult, not the same; moreover, the measurement error is difficult to avoid from different authors.

Analyses on archaeological samples indicate the necessity of direct pottery dating, as securely associated terrestrial samples are difficult to find for the assumedly earliest pottery in Northern Germany.

However, her team faced a problem: collecting samples was difficult.

Dr. Nichol said that he would like to see more testing, but added that he believed the group's findings, and acknowledged that obtaining samples was difficult and dangerous work.

When pile samples were difficult to collect, samples of the foundation threads were collected instead.

In addition, providing good-quality core samples is difficult especially in highly fractured and weathered rocks.

Because cooperation with hospital is still underway, actual samples were difficult to obtain.