On an overcast spring day, and descendants of internees - gathered at the college for a conference to recall those times, and to create a memorial to those who lived through it.

VOA: standard.2010.06.22

That m times a is the force the spring is exerting.

与 a 的乘积就等于弹簧产生的力

耶鲁公开课 - 基础物理课程节选

That m times a is the force the spring is exerting.

与 a 的乘积就等于弹簧产生的力

耶鲁公开课 - 基础物理课程节选