有没有非常明确的确定时间和地点，在它的书面。
There is nothing very definite to determine the time and place at which it was written.
我们很难确定巧克力诞生的确切年代，但有一点是很明确的，那就是自诞生之初，巧克力就一直备受珍爱。
It's hard to pin down exactly when chocolate was born, but it's clear that it was cherished from the start.
我们很难确定巧克力诞生的确切年代，但有一点是很明确的，那就是自诞生之初，巧克力就一直备受珍爱。
It's hard to pin down16 exactly when chocolate was born, but it's clear that it was cherished from the start.
虽然遗传因素对于AMD的确切作用目前尚不明确，但AMD的分子遗传学研究对于确定AMD的发病机制有重要作用。
Though the exact influence of gene is still not clear, molecular genetic study of AMD is very important for understanding the pathogenesis.
价值的确定决定了功能的选择，概念则需要明确界定。
The sureness of value has determined the choice of the function, and the concept needs the definite boundary.
通过分析，得出我国股份支付准则应该进一步明确股票期权公允价值的计量方法，包括模型的选择和相关参数的确定；
Then conclusions are acquired: measurement of stock option ought to be further expatiated in stock payment standard, including choice of model and establishment of corresponding parameters;
通过分析，得出我国股份支付准则应该进一步明确股票期权公允价值的计量方法，包括模型的选择和相关参数的确定；
Then conclusions are acquired: measurement of stock option ought to be further expatiated in stock payment standard, including choice of model and establishment of corresponding parameters;
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