Spring Festival is one of the most important festivals in China. It is also known as Chinese New Year, and it is celebrated on the first day of the lunar calendar, which typically falls between January and February. Here are 5 English sentences to introduce Spring Festival:

1. The Spring Festival is a time for family reunions and gatherings.
During the Spring Festival holiday, people travel from different parts of the country to return home and celebrate with their families. It is a tradition deeply rooted in Chinese culture. People also invite friends and relatives over to their homes for feasts and festivities.

2. Red is a prevalent color during the Spring Festival.
Red represents good fortune and luck in Chinese culture, which is why it is heavily featured during the Spring Festival. You will see red decorations and clothing everywhere during this time of year, like red couplets, lanterns, and fireworks.

3. People often give red envelopes to children during the Spring Festival.
Red envelopes, or hongbao in Chinese, are gifts of money given to children during the Spring Festival. Children love receiving them, and it is a way for adults to bless the children with good luck and fortune for the year to come.

4. Many traditional foods are eaten during the Spring Festival.
Every part of China has its own unique cuisine, but during Spring Festival, there are some traditional foods that are a must-eat, like dumplings, fish, and rice cakes. These foods have auspicious meanings, such as the fish symbolizing abundance. Many families also eat a big feast on New Year's Eve, which includes foods like roasted pork, chicken, and vegetables.

5. The Spring Festival celebrations last for 15 days.
The Spring Festival officially begins on New Year's Eve and lasts until the 15th day of the first lunar month. During these 15 days, there are various customs and traditions to celebrate the holiday, such as the dragon and lion dances, temple fairs, and visiting relatives and friends.

In conclusion, Spring Festival is a vibrant and significant holiday in Chinese culture. From family reunions, red decorations, and traditional foods to red envelopes and 15 days of celebrations, there's a lot to love and appreciate about the festival.