Of course, they must be careful not to let it take up too much of their time because study is still their primary responsibility.
当然，他们也必须小心，不要让打工占据太多时间，因为学业仍然是青少年首要的责任。
Of course, they must be careful not to let it take up too much of their time because study is still their primary responsibility.
当然，他们必须小心，不要让它占用太多的时间，因为学习仍然是他们的首要责任。
In summary, historians must be careful about the kind of conflict they emphasize in eighteenth-century America.
总之，历史学家必须谨慎对待他们所强调的18世纪美国的冲突类型。
But they must be small and careful to give us more insight into where we should be going.
但你的步子必须要迈得小而谨慎，至少让我们可以把方向看得更清楚些。
You must always be very careful to track where identities are established and how (if they can be) they are propagated.
您必须始终非常谨慎地对何处建立标识以及如何进行传播(如果可以传播)进行跟踪。
Obviously, the queue manager's administrators must be very careful about the primary group assigned to the user ID that they are using to define WebSphere MQ objects.
很明显，队列管理器的管理员在使用用户ID定义WebSphereMQ对象时，必须十分关注该用户ID的主要组。
Instructors must be careful with their behaviors, as behavior is a mirror in which they show their images and from which students learn from them.
教师必须注意自身的言行，因为行为是一面镜子，不但能够反映出教师的形象，也能够为学生树立榜样。
They will be staying around on the screen, occupying the front and center location, so they must be extra careful not to waste pixels on anything unnecessary.
非模态对话框也必须特别节约像素，它们驻留在屏幕上，占据前面的中心位置。所以必须特别小心，在不必要的情况下不要浪费像素。
Old people must be very careful as they climb a staircase.
年长的人在上楼梯时，必须得小心。
When they are played in the snow or in the rain, players must be more careful because mistakes are easily made.
当球赛在雪中或雨中比赛时，球员必须更加小心因为他们很容易出错。
With some, you adopt a more outgoing style; with others, you must be reserved and careful or they will feel threatened.
对于一些人，你采取更为积极的方式，而对于另一些人，你必须谨慎小心，不然他们会感到威胁。
On foggy days, the visibility is extremely low and it's dangerous for drivers. They must be very careful, or accidents may happen.
在能见度非常低的大雾天气，对司机来说是很危险的，他们必须非常小心地驾驶，否则很容易发生意外。
Third, they must be very careful and cautious.
第三，他们必须非常小心和谨慎。
Third, they must be very careful and cautious.
第三，他们必须非常小心和谨慎。
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