我知道这个问题在其他问题中已经提到过，但我找不到我的错误。这是我的代码：
\documentclass[11pt, oneside]{article}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{geometry}
\usepackage{graphicx}
\usepackage[square,numbers]{natbib}
\bibliographystyle{abbrvnat}
\usepackage{wrapfig}
\usepackage[font={small}]{caption}
\usepackage{float}
\usepackage{siunitx}
\usepackage{hyperref}
\title{...}
\author{...}
\date{22.02.2021}
\begin{document}
\maketitle
...
\cite{triton}
...
\medskip
\bibliographystyle{unsrt}
\bibliography{cit}
\end{document}
和我的 cit.bib 文件：
@report{Morrison1974,
abstract = {This paper reviews the physical nature of the satellites of the planets, excluding the Moon but including the rings of Saturn. Emphasis is placed on the best studied objects: Titan, Phobos and Deimos, the four Galilean satellites (Io, Europa, Ganymede, and Callisto), and the rings of Saturn.},
author = {David Morrison and Dale P Cruikshank},
title = {PHYSICAL PROPERTIES OF THE NATURAL SATELLITES*},
year = {1974}}
@report{triton,
abstract = {Thermal continuum and spectral line observations of Triton were performed in the 870 micron window in October 2016 using the Atacama Large Millime-ter/Submillimeter Array (ALMA). We find an average brightness temperature of 31.9±2.5 K for the surface, very similar to that found for Pluto in 2015 with the same ALMA spectral setup. We also detect emission from the CO(3-2) and HCN(4-3) rotation transitions, originating in Triton's atmosphere. The CO mole fraction ranges from 30-230 ppm, depending on the assumed surface pressure.},
author = {Mark Gurwell and Emmanuel Lellouch and Bryan J Butler and Raphael Moreno and Arielle Moullet and Darrell F Strobel},
title = {The Atmosphere of Triton Observed With ALMA}}
非常感谢您的帮助，我已经坐在这里一整天了 :/