Update dgram_createsocket_options_callback.md

dgram/dgram_createsocket_options_callback.md

@@ -10,22 +10,19 @@ changes:
                  supported now.
 -->
 
-* `options` {Object} Available options are:
-  * `type` {string} The family of socket. Must be either `'udp4'` or `'udp6'`.
-    Required.
-  * `reuseAddr` {boolean} When `true` [`socket.bind()`][] will reuse the
-    address, even if another process has already bound a socket on it.
-    Defaults to `false`.
-  * `recvBufferSize` {number} - Sets the `SO_RCVBUF` socket value.
-  * `sendBufferSize` {number} - Sets the `SO_SNDBUF` socket value.
-  * `lookup` {Function} Custom lookup function. Defaults to [`dns.lookup()`][].
-* `callback` {Function} Attached as a listener for `'message'` events. Optional.
-* Returns: {dgram.Socket}
+* `options` {Object} 允许的选项是:
+  * `type` {string} 套接字族. 必须是 `'udp4'` 或 `'udp6'`.
+    必需填.
+  * `reuseAddr` {boolean} 若设置为 `true` [`socket.bind()`][] ，则会
+    重用地址，即时另一个进程已经在其上面绑定了一个套接字。
+    默认是 `false`.
+  * `recvBufferSize` {number} - 设置 `SO_RCVBUF` 套接字值。
+  * `sendBufferSize` {number} - 设置 `SO_SNDBUF` 套接字值。
+  * `lookup` {Function} 惯常的查询函数. 默认是 [`dns.lookup()`][]。
+* `callback` {Function} 为 `'message'` 事件绑定一个监听器。可选。
+* 返回: {dgram.Socket}
 
-Creates a `dgram.Socket` object. Once the socket is created, calling
-[`socket.bind()`][] will instruct the socket to begin listening for datagram
-messages. When `address` and `port` are not passed to  [`socket.bind()`][] the
-method will bind the socket to the "all interfaces" address on a random port
-(it does the right thing for both `udp4` and `udp6` sockets). The bound address
-and port can be retrieved using [`socket.address().address`][] and
-[`socket.address().port`][].
+创建一个 `dgram.Socket` 对象. 一旦创建了套接字，调用
+[`socket.bind()`][] 会指示套接字开始监听数据报消息。如果 `address` 和 `port` 没传给  [`socket.bind()`][]，
+那么这个方法会把这个套接字绑定到 "全部接口" 地址的一个随机端口(这适用于 `udp4` 和 `udp6` 套接字)。
+绑定的地址和端口可以通过 [`socket.address().address`][] 和[`socket.address().port`][] 来获取。