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1.descend into 下降到
A pleasant evening can descend into a dispute about who had a starter and who ordered the lobster.
一个欢愉的夜晚随之便演变一场争论，争论谁点了开胃菜谁又点了龙虾。
2.pass through 通过
Much of the energy is absorbed as the Sun's rays pass through the atmosphere.
太阳光线通过大气层时许多能量被吸收去了。
3.at a time 每次
You can check your program one command at a time while it's running.
你可以在程序运行期间，逐条输入命令以对程序进行检查。
