他发现要赶上物理学的进展很难。
He find it hard to keep pace with the development in physics.
他发现要赶上物理学的进展很难。
He finds it hard to keep pace with the development in physics.
他发现要赶上物理学的进展很难。
这方面的进展是近年来高分子物理学中引人注目的方面。
Remarkable progress has been made in this branch of polymer physics in recent years.
这方面的进展是近年来高分子物理学中引人注目的方面。
Remarkable progress has been made in this branch of polymer physics in recent years.
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