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.
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.
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.
一些确切的明确上述波的参数表示的是确定的。
Some exact explicit parametric representations of the above waves are determined.
一些确切的明确上述波的参数表示的是确定的。
Some exact explicit parametric representations of the above waves are determined.
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