问在内部调用其他异步方法时，方法签名中是否需要使用async关键字？

EN

    public Task<IHttpActionResult> GetAsync()
    {
        return GetOneAsync();
    }
    public async Task<IHttpActionResult> GetAsync2()
    {
        return await GetOneAsync();
    }
    private async Task<IHttpActionResult> GetOneAsync()
    {
        using (var httpClient = new HttpClient())
        {
            await httpClient.GetAsync("http://baidu.com");
        }
        return Ok();
    }