The+title+is+a+reference+to+the+very+first+Educational+Round+from+our+writers+team

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the writers of the two texts in this unit convey to us the message that we n

eed to take care of our environment and make efforts to protect it.

在本单元的两篇文字中，写作者向我们传达了一个信息，那就是我们需要关心环境并努力保护它。

首先，第一篇文章着重强调了环境破坏对人们生活的影响。它指出了大气污染、水质污染和森林砍伐等问题对人类健康和生活质量造成的危害。作者通过使用一些具体的数字和案例来支持他们的观点，让我们对环境问题有了更深入的了解。这篇文章教育我们，如果我们不采取行动，我们的环境将变得越来越恶劣，对我们的生活和后代的生活造成严重威胁。

第二篇文章则关注了环境保护的重要性。它着眼于人们对环境的消极态度和过度消费的问题，并提出了一些解决方法。作者鼓励我们采取可持续的生活方式，如减少能源消耗、回收废弃物、种植树木等。文章还提出了政府和公众的责任，强调了每个人都可以为环境保护做出贡献，并呼吁大家共同努力来保护我们的星球。

通过这两篇文章，我们可以看到环境保护是一个紧迫的问题，并且需要我们每个人的努力。无论是个人还是集体，我们都应该采取行动来减少对环境的负面影响。只有通过持续的努力和改变我们的行为，我们才能确保未来的可持续发展，并让我们的子孙后代继续在一个美丽而健康的环境中生活。

Write the code about Readers-Writer Problem Implementation.1、 A data set is shared among several concurrent processes: Readers – only read the data set; they do not perform any updates. Writers – can both read and write. 2、 Problem – allow multiple readers (at most 8) to read at the same time. Only one single writer can access the shared data at the same time

Here is an implementation of the Readers-Writer problem in Python, using semaphores:

import threading

class ReadersWriterLock:
    def __init__(self):
        self.lock = threading.Lock()
        self.readers_sem = threading.Semaphore(8)
        self.writers_sem = threading.Semaphore(1)
        self.read_count = 0
    
    def acquire_read(self):
        with self.lock:
            self.read_count += 1
            if self.read_count == 1:
                self.writers_sem.acquire()
        self.readers_sem.acquire()
    
    def release_read(self):
        self.readers_sem.release()
        with self.lock:
            self.read_count -= 1
            if self.read_count == 0:
                self.writers_sem.release()
    
    def acquire_write(self):
        self.writers_sem.acquire()
    
    def release_write(self):
        self.writers_sem.release()

This implementation uses two semaphores - one for readers and one for writers. The `readers_sem` semaphore has a maximum count of 8, allowing up to 8 readers to hold the semaphore at the same time. The `writers_sem` semaphore has a maximum count of 1, allowing only one writer to hold the semaphore at a time.

When a reader wants to read the shared data, it first acquires the `readers_sem` semaphore, which allows up to 8 readers to hold it concurrently. It also increments the `read_count` variable, which keeps track of how many readers are currently reading the data. If this is the first reader, the reader also acquires the `writers_sem` semaphore to prevent any writers from accessing the data while it is being read.

When a reader is done reading the data, it releases the `readers_sem` semaphore and decrements the `read_count` variable. If this was the last reader, the reader also releases the `writers_sem` semaphore to allow any waiting writers to access the data.

When a writer wants to write to the shared data, it first acquires the `writers_sem` semaphore, which allows only one writer to hold it at a time. This prevents any other readers or writers from accessing the data while it is being written to.

When the writer is done writing to the data, it releases the `writers_sem` semaphore to allow any waiting readers or writers to access the data.