There are a number of very large challenges in field work. Some of the biggest challenges are dealing with situations you were not prepared to deal with.
lie
There are a number of challenges that are faced during field work. Not knowing the environment for example can be a huge challenge.
The biggest challenge for him is not sounding horrible and repetitive. It is a challenge he still hasn't overcome.
Galileo's biggest challenge that he has faced is building telescope.
The biggest challenge of being an architect is competition in the market. Once you step out you will realize that almost everything has been designed and constructed already. You must find that thing, the creativity that makes you stand out from other designers in your field.
her biggest challenge was facing all of the lies and splitting up of her family
one of the most biggest challengings was fighting for what they wanted.
Developing new antibiotics that are effective against multi-drug resistant strains of pathogenic bacteria such as methicillin resistant Staph.
I think her biggest challenge was one that she couldn't meat. It was her failed attempt to manipulate Octavian into feeling sorry for her and forgiving her.
something
Pneumonia
The Panic of 1837 was Van Buren's biggest challenge. The resulting economic slump was no doubt the biggest factor in his defeat for re-election in 1840.