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like: central point
VNEN
trung điểm
*
☊
central point
*
☊
VNEN
trọng tâm
*
☊
center (of gravity), central point
*
☊
trung điểm * ☊ 
central point * ☊ trọng tâm * ☊ center (of gravity), central point * ☊ trung điểm * ☊ central point * ☊ trọng tâm * ☊ center (of gravity), central point * ☊