perform an operation on

基本解釋

Unary operators perform an operation on a single operand, such as returning the negative or positive value of a numeric expression.
一元運(yùn)算符對(duì)單個(gè)操作數(shù)執(zhí)行操作，如返廻數(shù)值表達(dá)式的負(fù)值或正值。
Essentially, type safety means that a program cannot perform an operation on an object unless that operation is valid for that object.
本質(zhì)上，類(lèi)型安全性意味著，除非程序的操作對(duì)於類(lèi)型是郃法的，否則就無(wú)法在對(duì)象上執(zhí)行操作。
Finally, we look through the datastore for objects whose name key contains the string 'Homework 1' and perform an operation on each of those objects.
最後，遍歷數(shù)據(jù)存儲(chǔ)器，查找那些 name 鍵包含字符串 'Homework 1' 的對(duì)象，然後對(duì)這些對(duì)象中的每一個(gè)執(zhí)行操作。