我们可以在没有Google密钥的情况下使用google-translate吗？

<?php
// Basic request parameters:
// s = source language
// d = destination language
// q = Text to be translated

$s = $_REQUEST[\'s\'];
if(!$s)echo \"translate.php?s=en&d=es&q=Hello%20World\";
$d = $_REQUEST[\'d\'];
$lang_pair = urlencode($s.\'|\'.$d);
$q = urlencode($_REQUEST[\'q\']);

// Google\'s API translator URL
$url = \"http://ajax.googleapis.com/ajax/services/language/translate?v=1.0&q=\".$q.\"&langpair=\".$lang_pair;

// Make sure to set CURLOPT_REFERER because Google doesn\'t like if you leave the referrer out
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_REFERER, \"http://www.yoursite.com/translate.php\");
$body = curl_exec($ch);
curl_close($ch);

$json = json_decode($body, true);
echo $json[\'responseData\'][\'translatedText\'];
?>