1 [C] a guess about a future amount, situation, etc based on the present situation （根据目前情况对未来的数量、情况等所作的）预测，估计，推测: sales projections for the next five years 未来五年的估计销售额

2 [U] the act of making light, a picture from a film, etc appear on a surface （光线、电影影像等的）投影，投射，放映