Themicrobe is difficult to detect in adult animals, and is apparent only when they gestate.
Because testosterone is naturally produced by the human body, it is difficult to detect in low doses.
Though it's difficult to detect in admissions statistics, university language courses are changing, with more opportunities for students to study a language from scratch.
Asbestosis is more difficult to detect in the early stages because chest X rays usually reveal little until the disease is advanced.
Besides creating an uneven playing field, some calming drugs can endanger horse and rider, and be difficult to detect in post-competition testing.
Ectoparasites are often difficult to detect in the field.
Therefore, the resonance peaks are poorly-expressed for these waves and difficult to detect in observations.
The presence of the ingluvies is very difficult to detect in typical fossils.
Also, breast cancer is more difficult to detect in mammographically dense breasts [5, 6].
Besides, the diffraction peaks from GO are difficult to detect in the PEDOT/GO and PEDOT/GO/MnO2 nanocomposites, which may be due to a low mass ratio.
Polyps situated on a fold are particularly difficult to detect in 2D as sometimes they look like a normal extension of the semi-lunar fold.
