他坚定的决心帮助他克服了所有困难。

His strong ___determination helped him overcome all the difficulties.

她的决心帮助她克服了所有困难。

Her ___determination helped her overcome all the difficulties.

科学家们花了数月时间通过实验来确定这种物质的精确成分。

The scientists spent months making ___determinations of the exact composition of this substance through experiments.