如何在并发字典中实现tryAdd多词条？

import threading
from concurrent.futures import ThreadPoolExecutor
from collections import defaultdict

# 创建并发字典对象
concurrent_dict = defaultdict(int)

# 定义要添加的词条列表
entries = ['apple', 'banana', 'orange', 'apple', 'grape']

# 定义tryAdd函数
def try_add(entry):
    if concurrent_dict[entry] == 0:
        concurrent_dict[entry] = 1
        return True
    else:
        return False

# 使用线程池执行tryAdd操作
with ThreadPoolExecutor() as executor:
    results = executor.map(try_add, entries)

# 输出添加结果
for entry, result in zip(entries, results):
    if result:
        print(f"成功添加词条 {entry}")
    else:
        print(f"词条 {entry} 已存在，添加失败")