Tuesday morning at 9 o'clock in Engpsh is "Tuesday morning at 9 o'clock."

The use of "Tuesday" to refer to the third day of the week comes from the Old Engpsh "Tiwesdæg," named after the Anglo-Saxon god of war, Tiw. "Morning" is a time period between midnight and noon, and "at 9 o'clock" refers to the specific point in time when the clock reads 9.

Examples:

"I have a meeting scheduled for Tuesday morning at 9 o'clock." (我定了一个周二上午九点的会议。)
"Can we schedule a call for Tuesday morning at 9 o'clock?" (我们能不能安排一个周二上午九点的电话会议?)
"I'll see you on Tuesday morning at 9 o'clock." (我星期二上午九点见。)