Hypergolic fuels are extremely toxic and thus difficult to handle.
Many of the details of Mr. Trump's proposals are sketchy and thus difficult to analyze.
The carpals are not fully ossified and thus difficult to discern.
The Human heart is an irregular 3D object and thus difficult to reproduce.
Blake's twitch was slight indeed, however, and thus difficult to spot in real time.
Like its sister attribute, executive presence, executive voice can seem somewhat intangible and thus difficult to define.
Social or religious inequality is deeply ingrained in some cultures and thus difficult to overcome (see caste).
A more pertinent question is whether Mexican democratisation is for real and thus difficult to reverse, even if the PRI returns to office.
Many of the measures that work in other countries are culturally specific, and thus difficult to emulate.
It wasn't true, yet I found the idea analogous to the problem of developing good clinical education: it's difficult to see and thus difficult to target for rewards.
However, bacterial cellulose changes its properties depending on its water content, and becomes extremely brittle, and thus difficult to handle, when it is dry.
