This is the 3938th most frequent Chinese word.
之际
"之际" means "at the time of" or "during."
In this context, "之际" denotes a particular period when the enthusiasm for learning is high, emphasizing a favorable timing.
学习兴趣浓厚之际,是提高效率的好时机。
At the peak of learning interest, it is a good time to enhance efficiency.
Here, "之际" is used to indicate the specific moment or occasion when the departure occurs.
在离别之际,我们都感到不舍。
At the time of departure, we all felt reluctance.
"之际" specifies the occasion of welcoming the New Year in this sentence.