Positive cam
[機] 確動凸輪
?? 詞語組成解析
positive
['pɑz?t?v]
adj. 積極的;確實的，肯定的;[數]正的;[醫]陽性的;
n. 正面;正片;[語]原級形容詞;[數]正量;
posit肯定+ive形容詞后綴 → 肯定的；積極的
n. 凸輪, 計算機輔助制造, 中央地址存儲器\\n[計] 計算機輔助制造; 計算機輔助生產
??? 情景例句
You and Mommy used to take me on the ferryboat.
你和媽媽常帶我坐渡船。
This nation is noted for its political stability.
這個國家以政治穩定聞名。
You've done very well. It's a pity you missed the sports meeting last week.
你學得不錯嘛。很可惜，你錯過了上周的運動會。