核心问题
My suggestion is that we should add some sand to this soil.
我不明白上面句子里的 should 是什么意思？是否可译为“应当”？
词典解答
有些名词,如 suggestion, order, decision, demand, request, 在正式语体中要求其表语从句(如上句)和同位语从句使用 should + 动词原形(英国英语)或现在虚拟式(即动词原形):
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Our decision is that the school remain closed. 我们的决定是学校继续关闭。
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The orders are that we stay here. 命令要求我们停留在这里。
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He gave orders that the work should be started at once. 他命令立即开始工作。