The phrase "activity at that time" is correct and usable in written English.
It can be used to refer to a specific action or event that was occurring during a particular period.
Example: "The activity at that time was focused on community outreach and engagement."
Alternatives: "event during that period" or "action at that moment".
Conversely, gill Na+, K+-ATPase activity at that time was significantly higher in triploid than diploid fish.
Tunnelling was a very popular activity at that time, and a great deal of ingenuity went into devising hiding places and routes of escape.
It was imperative that any cultural activity at that time should show to the outside world that China still existed as an undefeated nation.
The F.B.I. interviewed Mr. Tsarnaev and his family in Boston but found no sign of terrorism activity at that time, the agency said.
Asked if he had been assured by Mr. Fields that Mr. Pellicano was doing nothing illegal, Mr. Grey first said yes, then added: "I don't know that we ever had a specific conversation about illegal activity at that time.
The simplest explanation for this active interval is that favorable climate conditions (El Niño, West African Monsoon, and sea surface temperatures) encouraged North Atlantic hurricane activity at that time.
For example, suppose the suspect did not commit the crime in question but was engaged in some activity at the time that, although perfectly legal, he or she was ashamed of.
The divers' spokesman said that study of the vessel could help add to understanding of commercial activity at the time and that it might even be possible to bring the entire ship to the surface.
Many brokerage firms began playing down the retail arm of the business in favor of investment banking activities at that time.
The file then immediately connects Mr. Libbi's activities at that time to Abbottabad, stating, "In mid-2003, detainee moved his family to Abbottabad, PK and worked between Abbottabad and Peshawar".
Your name will be listed in the Commencement Program the following May and you can participate in commencement activities at that time.
