贸易收支属于国际收支中的经常项目。经常项目是指一个国家或地区在一定时期内，由于对外经济往来而发生的收入和支出的交易项目，包括商品和服务的进出口、对外投资收益、侨汇、无偿援助和捐赠等。贸易收支是指一个国家或地区与其他国家或地区之间因商品和服务的进出口而产生的支付与收入。

在国际贸易中，贸易收支是一个重要的经济指标，它反映了一个国家或地区对外经济往来的规模和结构。一个国家的贸易收支状况受到多种因素的影响，如国际市场需求、国内供给能力、汇率水平、贸易政策等。当一个国家的贸易收支出现顺差时，意味着该国的出口额大于进口额，这通常意味着该国的经济状况较好，因为出口是经济增长的重要推动力。相反，当贸易收支出现逆差时，意味着该国的进口额大于出口额，这可能对该国的经济造成负面影响。

英文解释：Trade balance falls under the current account of the balance of payments. The current account is a section of the balance of payments that records the flow of goods, services, and primary income in and out of a country. It includes transactions such as the import and export of goods and services, investment income, remittances, and foreign aid and donations. The trade balance represents the payment and receipt of income generated by the import and export of goods and services between a country and other countries.

The trade balance is an important economic indicator in international trade that reflects the scale and structure of a country's economic exchanges with other countries. The trade balance is affected by various factors, including international market demand, domestic supply capacity, exchange rate levels, and trade policies. When a country experiences a trade surplus, it means that the country's export value is greater than its import value, often indicating a healthy economic condition as exports are a key driver of economic growth. Conversely, when there is a trade deficit, it means that the country's import value exceeds its export value, which can have negative impacts on the country's economy.