是否将两行合并为一行？

var line1 = "Hello";
var line2 = "World";
var mergedLine = line1 + line2;
console.log(mergedLine);  // 输出：HelloWorld

line1 = "Hello"
line2 = "World"
merged_line = line1 + line2
print(merged_line)  # 输出：HelloWorld

String line1 = "Hello";
String line2 = "World";
String mergedLine = line1 + line2;
System.out.println(mergedLine);  // 输出：HelloWorld

$line1 = "Hello";
$line2 = "World";
$mergedLine = $line1 . $line2;
echo $mergedLine;  // 输出：HelloWorld